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Finding the Fourth Proportional to 93.69, 129.24 and 71.91

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Solution

The fourth proportional to 93.69, 129.24 and 71.91 is: 99.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.69 : 129.24 = 71.91 : x
  2. Step 2: Convert to fraction form
    93.69/129.24 = 71.91/x
  3. Step 3: Cross multiply
    93.69x = 129.24 × 71.91
  4. Step 4: Simplify right side
    93.69x = 9,293.65
  5. Step 5: Solve for x
    x = 9,293.65/93.69
  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.