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Finding the Fourth Proportional to 126.88, 176.08 and 117.28

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Solution

The fourth proportional to 126.88, 176.08 and 117.28 is: 162.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.88 : 176.08 = 117.28 : x
  2. Step 2: Convert to fraction form
    126.88/176.08 = 117.28/x
  3. Step 3: Cross multiply
    126.88x = 176.08 × 117.28
  4. Step 4: Simplify right side
    126.88x = 20,650.66
  5. Step 5: Solve for x
    x = 20,650.66/126.88
  6. Step 6: Final answer
    x = 162.76

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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.