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Finding the Fourth Proportional to 721,885.62, 996,190.08 and 399,588.78

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Solution

The fourth proportional to 721,885.62, 996,190.08 and 399,588.78 is: 551,425.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,885.62 : 996,190.08 = 399,588.78 : x
  2. Step 2: Convert to fraction form
    721,885.62/996,190.08 = 399,588.78/x
  3. Step 3: Cross multiply
    721,885.62x = 996,190.08 × 399,588.78
  4. Step 4: Simplify right side
    721,885.62x = 398,066,378,715.30
  5. Step 5: Solve for x
    x = 398,066,378,715.30/721,885.62
  6. Step 6: Final answer
    x = 551,425.83

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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.