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Finding the Fourth Proportional to 93.54, 128.97 and 91.65

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Solution

The fourth proportional to 93.54, 128.97 and 91.65 is: 126.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.54 : 128.97 = 91.65 : x
  2. Step 2: Convert to fraction form
    93.54/128.97 = 91.65/x
  3. Step 3: Cross multiply
    93.54x = 128.97 × 91.65
  4. Step 4: Simplify right side
    93.54x = 11,820.10
  5. Step 5: Solve for x
    x = 11,820.10/93.54
  6. Step 6: Final answer
    x = 126.36

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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.