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Finding the Fourth Proportional to 721,624.30, 995,827.28 and 399,334.30

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Solution

The fourth proportional to 721,624.30, 995,827.28 and 399,334.30 is: 551,073.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,624.30 : 995,827.28 = 399,334.30 : x
  2. Step 2: Convert to fraction form
    721,624.30/995,827.28 = 399,334.30/x
  3. Step 3: Cross multiply
    721,624.30x = 995,827.28 × 399,334.30
  4. Step 4: Simplify right side
    721,624.30x = 397,667,985,293.46
  5. Step 5: Solve for x
    x = 397,667,985,293.46/721,624.30
  6. Step 6: Final answer
    x = 551,073.44

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Half scale
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Double scale
Find fourth proportional to 721,625.30, 995,828.65 and 399,335.30
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.