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Finding the Fourth Proportional to 101.67, 151.86 and 87.15

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Solution

The fourth proportional to 101.67, 151.86 and 87.15 is: 130.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.67 : 151.86 = 87.15 : x
  2. Step 2: Convert to fraction form
    101.67/151.86 = 87.15/x
  3. Step 3: Cross multiply
    101.67x = 151.86 × 87.15
  4. Step 4: Simplify right side
    101.67x = 13,234.60
  5. Step 5: Solve for x
    x = 13,234.60/101.67
  6. Step 6: Final answer
    x = 130.17

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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.