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Finding the Fourth Proportional to 169.14, 233.42 and 99.21

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Solution

The fourth proportional to 169.14, 233.42 and 99.21 is: 136.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.14 : 233.42 = 99.21 : x
  2. Step 2: Convert to fraction form
    169.14/233.42 = 99.21/x
  3. Step 3: Cross multiply
    169.14x = 233.42 × 99.21
  4. Step 4: Simplify right side
    169.14x = 23,155.94
  5. Step 5: Solve for x
    x = 23,155.94/169.14
  6. Step 6: Final answer
    x = 136.90

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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.