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Finding the Fourth Proportional to 93.13, 128.42 and 66.91

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Solution

The fourth proportional to 93.13, 128.42 and 66.91 is: 92.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.13 : 128.42 = 66.91 : x
  2. Step 2: Convert to fraction form
    93.13/128.42 = 66.91/x
  3. Step 3: Cross multiply
    93.13x = 128.42 × 66.91
  4. Step 4: Simplify right side
    93.13x = 8,592.58
  5. Step 5: Solve for x
    x = 8,592.58/93.13
  6. Step 6: Final answer
    x = 92.26

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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.