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Finding the Fourth Proportional to 721,781.28, 995,919.84 and 399,476.16

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Solution

The fourth proportional to 721,781.28, 995,919.84 and 399,476.16 is: 551,200.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,781.28 : 995,919.84 = 399,476.16 : x
  2. Step 2: Convert to fraction form
    721,781.28/995,919.84 = 399,476.16/x
  3. Step 3: Cross multiply
    721,781.28x = 995,919.84 × 399,476.16
  4. Step 4: Simplify right side
    721,781.28x = 397,846,233,351.01
  5. Step 5: Solve for x
    x = 397,846,233,351.01/721,781.28
  6. Step 6: Final answer
    x = 551,200.54

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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.