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Finding the Fourth Proportional to 93.71, 140.28 and 91.38

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Solution

The fourth proportional to 93.71, 140.28 and 91.38 is: 136.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.71 : 140.28 = 91.38 : x
  2. Step 2: Convert to fraction form
    93.71/140.28 = 91.38/x
  3. Step 3: Cross multiply
    93.71x = 140.28 × 91.38
  4. Step 4: Simplify right side
    93.71x = 12,818.69
  5. Step 5: Solve for x
    x = 12,818.69/93.71
  6. Step 6: Final answer
    x = 136.80

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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.