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Finding the Fourth Proportional to 128.54, 178.15 and 126.62

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Solution

The fourth proportional to 128.54, 178.15 and 126.62 is: 175.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.54 : 178.15 = 126.62 : x
  2. Step 2: Convert to fraction form
    128.54/178.15 = 126.62/x
  3. Step 3: Cross multiply
    128.54x = 178.15 × 126.62
  4. Step 4: Simplify right side
    128.54x = 22,557.35
  5. Step 5: Solve for x
    x = 22,557.35/128.54
  6. Step 6: Final answer
    x = 175.49

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.