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Finding the Fourth Proportional to 128.91, 178.10 and 97.93

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Solution

The fourth proportional to 128.91, 178.10 and 97.93 is: 135.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.91 : 178.10 = 97.93 : x
  2. Step 2: Convert to fraction form
    128.91/178.10 = 97.93/x
  3. Step 3: Cross multiply
    128.91x = 178.10 × 97.93
  4. Step 4: Simplify right side
    128.91x = 17,441.33
  5. Step 5: Solve for x
    x = 17,441.33/128.91
  6. Step 6: Final answer
    x = 135.30

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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.