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Finding the Fourth Proportional to 721,625.30, 995,828.65 and 399,335.30

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Solution

The fourth proportional to 721,625.30, 995,828.65 and 399,335.30 is: 551,074.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,625.30 : 995,828.65 = 399,335.30 : x
  2. Step 2: Convert to fraction form
    721,625.30/995,828.65 = 399,335.30/x
  3. Step 3: Cross multiply
    721,625.30x = 995,828.65 × 399,335.30
  4. Step 4: Simplify right side
    721,625.30x = 397,669,532,696.35
  5. Step 5: Solve for x
    x = 397,669,532,696.35/721,625.30
  6. Step 6: Final answer
    x = 551,074.82

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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.