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Finding the Fourth Proportional to 93.74, 129.38 and 71.87

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Solution

The fourth proportional to 93.74, 129.38 and 71.87 is: 99.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.74 : 129.38 = 71.87 : x
  2. Step 2: Convert to fraction form
    93.74/129.38 = 71.87/x
  3. Step 3: Cross multiply
    93.74x = 129.38 × 71.87
  4. Step 4: Simplify right side
    93.74x = 9,298.54
  5. Step 5: Solve for x
    x = 9,298.54/93.74
  6. Step 6: Final answer
    x = 99.20

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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.