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Finding the Fourth Proportional to 93.71, 129.31 and 66.12

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Solution

The fourth proportional to 93.71, 129.31 and 66.12 is: 91.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.71 : 129.31 = 66.12 : x
  2. Step 2: Convert to fraction form
    93.71/129.31 = 66.12/x
  3. Step 3: Cross multiply
    93.71x = 129.31 × 66.12
  4. Step 4: Simplify right side
    93.71x = 8,550.57
  5. Step 5: Solve for x
    x = 8,550.57/93.71
  6. Step 6: Final answer
    x = 91.25

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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.