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Finding the Fourth Proportional to 169.28, 233.61 and 91.66

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Solution

The fourth proportional to 169.28, 233.61 and 91.66 is: 126.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.28 : 233.61 = 91.66 : x
  2. Step 2: Convert to fraction form
    169.28/233.61 = 91.66/x
  3. Step 3: Cross multiply
    169.28x = 233.61 × 91.66
  4. Step 4: Simplify right side
    169.28x = 21,411.88
  5. Step 5: Solve for x
    x = 21,411.88/169.28
  6. Step 6: Final answer
    x = 126.49

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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.