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Finding the Fourth Proportional to 861,317, 1,188,605.85 and 479,343.68

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Solution

The fourth proportional to 861,317, 1,188,605.85 and 479,343.68 is: 661,487.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,317 : 1,188,605.85 = 479,343.68 : x
  2. Step 2: Convert to fraction form
    861,317/1,188,605.85 = 479,343.68/x
  3. Step 3: Cross multiply
    861,317x = 1,188,605.85 × 479,343.68
  4. Step 4: Simplify right side
    861,317x = 569,750,702,208.53
  5. Step 5: Solve for x
    x = 569,750,702,208.53/861,317
  6. Step 6: Final answer
    x = 661,487.82

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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.