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Finding the Fourth Proportional to 721,639.89, 995,864.99 and 399,372.21

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Solution

The fourth proportional to 721,639.89, 995,864.99 and 399,372.21 is: 551,134.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,639.89 : 995,864.99 = 399,372.21 : x
  2. Step 2: Convert to fraction form
    721,639.89/995,864.99 = 399,372.21/x
  3. Step 3: Cross multiply
    721,639.89x = 995,864.99 × 399,372.21
  4. Step 4: Simplify right side
    721,639.89x = 397,720,799,921.07
  5. Step 5: Solve for x
    x = 397,720,799,921.07/721,639.89
  6. Step 6: Final answer
    x = 551,134.72

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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.