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Finding the Fourth Proportional to 721,333.96, 995,432.26 and 399,018.76

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Solution

The fourth proportional to 721,333.96, 995,432.26 and 399,018.76 is: 550,641.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,333.96 : 995,432.26 = 399,018.76 : x
  2. Step 2: Convert to fraction form
    721,333.96/995,432.26 = 399,018.76/x
  3. Step 3: Cross multiply
    721,333.96x = 995,432.26 × 399,018.76
  4. Step 4: Simplify right side
    721,333.96x = 397,196,146,049.20
  5. Step 5: Solve for x
    x = 397,196,146,049.20/721,333.96
  6. Step 6: Final answer
    x = 550,641.13

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Double scale
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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.