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Finding the Fourth Proportional to 128.86, 176.60 and 126.97

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Solution

The fourth proportional to 128.86, 176.60 and 126.97 is: 174.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.86 : 176.60 = 126.97 : x
  2. Step 2: Convert to fraction form
    128.86/176.60 = 126.97/x
  3. Step 3: Cross multiply
    128.86x = 176.60 × 126.97
  4. Step 4: Simplify right side
    128.86x = 22,422.06
  5. Step 5: Solve for x
    x = 22,422.06/128.86
  6. Step 6: Final answer
    x = 174.01

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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.