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Finding the Fourth Proportional to 128.20, 176.72 and 93.17

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Solution

The fourth proportional to 128.20, 176.72 and 93.17 is: 128.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.20 : 176.72 = 93.17 : x
  2. Step 2: Convert to fraction form
    128.20/176.72 = 93.17/x
  3. Step 3: Cross multiply
    128.20x = 176.72 × 93.17
  4. Step 4: Simplify right side
    128.20x = 16,464.12
  5. Step 5: Solve for x
    x = 16,464.12/128.20
  6. Step 6: Final answer
    x = 128.43

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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.