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Finding the Fourth Proportional to 93.71, 139.87 and 91.14

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Solution

The fourth proportional to 93.71, 139.87 and 91.14 is: 136.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.71 : 139.87 = 91.14 : x
  2. Step 2: Convert to fraction form
    93.71/139.87 = 91.14/x
  3. Step 3: Cross multiply
    93.71x = 139.87 × 91.14
  4. Step 4: Simplify right side
    93.71x = 12,747.75
  5. Step 5: Solve for x
    x = 12,747.75/93.71
  6. Step 6: Final answer
    x = 136.03

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.