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Finding the Fourth Proportional to 639,561.90, 959,688.45 and 284,630.70

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Solution

The fourth proportional to 639,561.90, 959,688.45 and 284,630.70 is: 427,099.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,561.90 : 959,688.45 = 284,630.70 : x
  2. Step 2: Convert to fraction form
    639,561.90/959,688.45 = 284,630.70/x
  3. Step 3: Cross multiply
    639,561.90x = 959,688.45 × 284,630.70
  4. Step 4: Simplify right side
    639,561.90x = 273,156,795,305.42
  5. Step 5: Solve for x
    x = 273,156,795,305.42/639,561.90
  6. Step 6: Final answer
    x = 427,099.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.