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Finding the Fourth Proportional to 157,791.31, 217,752.80 and 86,171.33

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Solution

The fourth proportional to 157,791.31, 217,752.80 and 86,171.33 is: 118,916.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,791.31 : 217,752.80 = 86,171.33 : x
  2. Step 2: Convert to fraction form
    157,791.31/217,752.80 = 86,171.33/x
  3. Step 3: Cross multiply
    157,791.31x = 217,752.80 × 86,171.33
  4. Step 4: Simplify right side
    157,791.31x = 18,764,048,002.96
  5. Step 5: Solve for x
    x = 18,764,048,002.96/157,791.31
  6. Step 6: Final answer
    x = 118,916.87

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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.