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Finding the Fourth Proportional to 721,641.39, 995,867.06 and 399,373.71

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Solution

The fourth proportional to 721,641.39, 995,867.06 and 399,373.71 is: 551,136.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,641.39 : 995,867.06 = 399,373.71 : x
  2. Step 2: Convert to fraction form
    721,641.39/995,867.06 = 399,373.71/x
  3. Step 3: Cross multiply
    721,641.39x = 995,867.06 × 399,373.71
  4. Step 4: Simplify right side
    721,641.39x = 397,723,122,418.99
  5. Step 5: Solve for x
    x = 397,723,122,418.99/721,641.39
  6. Step 6: Final answer
    x = 551,136.79

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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.