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Finding the Fourth Proportional to 93.91, 140.65 and 91.18

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Solution

The fourth proportional to 93.91, 140.65 and 91.18 is: 136.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.91 : 140.65 = 91.18 : x
  2. Step 2: Convert to fraction form
    93.91/140.65 = 91.18/x
  3. Step 3: Cross multiply
    93.91x = 140.65 × 91.18
  4. Step 4: Simplify right side
    93.91x = 12,824.47
  5. Step 5: Solve for x
    x = 12,824.47/93.91
  6. Step 6: Final answer
    x = 136.56

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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.