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Finding the Fourth Proportional to 721,597.68, 995,789.90 and 399,307.59

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Solution

The fourth proportional to 721,597.68, 995,789.90 and 399,307.59 is: 551,036.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,597.68 : 995,789.90 = 399,307.59 : x
  2. Step 2: Convert to fraction form
    721,597.68/995,789.90 = 399,307.59/x
  3. Step 3: Cross multiply
    721,597.68x = 995,789.90 × 399,307.59
  4. Step 4: Simplify right side
    721,597.68x = 397,626,466,113.61
  5. Step 5: Solve for x
    x = 397,626,466,113.61/721,597.68
  6. Step 6: Final answer
    x = 551,036.23

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Double scale
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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.