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Finding the Fourth Proportional to 128.18, 176.08 and 126.38

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Solution

The fourth proportional to 128.18, 176.08 and 126.38 is: 173.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.18 : 176.08 = 126.38 : x
  2. Step 2: Convert to fraction form
    128.18/176.08 = 126.38/x
  3. Step 3: Cross multiply
    128.18x = 176.08 × 126.38
  4. Step 4: Simplify right side
    128.18x = 22,252.99
  5. Step 5: Solve for x
    x = 22,252.99/128.18
  6. Step 6: Final answer
    x = 173.61

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.