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Finding the Fourth Proportional to 101.32, 151.43 and 81.86

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Solution

The fourth proportional to 101.32, 151.43 and 81.86 is: 122.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.32 : 151.43 = 81.86 : x
  2. Step 2: Convert to fraction form
    101.32/151.43 = 81.86/x
  3. Step 3: Cross multiply
    101.32x = 151.43 × 81.86
  4. Step 4: Simplify right side
    101.32x = 12,394.89
  5. Step 5: Solve for x
    x = 12,394.89/101.32
  6. Step 6: Final answer
    x = 122.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.