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Finding the Fourth Proportional to 721,885.97, 996,190.55 and 399,589.13

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Solution

The fourth proportional to 721,885.97, 996,190.55 and 399,589.13 is: 551,426.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,885.97 : 996,190.55 = 399,589.13 : x
  2. Step 2: Convert to fraction form
    721,885.97/996,190.55 = 399,589.13/x
  3. Step 3: Cross multiply
    721,885.97x = 996,190.55 × 399,589.13
  4. Step 4: Simplify right side
    721,885.97x = 398,066,915,188.72
  5. Step 5: Solve for x
    x = 398,066,915,188.72/721,885.97
  6. Step 6: Final answer
    x = 551,426.31

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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.