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Finding the Fourth Proportional to 85,687, 128,613.60 and 41,344.90

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Solution

The fourth proportional to 85,687, 128,613.60 and 41,344.90 is: 62,057.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,687 : 128,613.60 = 41,344.90 : x
  2. Step 2: Convert to fraction form
    85,687/128,613.60 = 41,344.90/x
  3. Step 3: Cross multiply
    85,687x = 128,613.60 × 41,344.90
  4. Step 4: Simplify right side
    85,687x = 5,317,516,430.64
  5. Step 5: Solve for x
    x = 5,317,516,430.64/85,687
  6. Step 6: Final answer
    x = 62,057.45

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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.