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Finding the Fourth Proportional to 101.25, 151.17 and 86.04

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Solution

The fourth proportional to 101.25, 151.17 and 86.04 is: 128.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.25 : 151.17 = 86.04 : x
  2. Step 2: Convert to fraction form
    101.25/151.17 = 86.04/x
  3. Step 3: Cross multiply
    101.25x = 151.17 × 86.04
  4. Step 4: Simplify right side
    101.25x = 13,006.67
  5. Step 5: Solve for x
    x = 13,006.67/101.25
  6. Step 6: Final answer
    x = 128.46

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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.