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Finding the Fourth Proportional to 101.92, 152.77 and 90.87

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Solution

The fourth proportional to 101.92, 152.77 and 90.87 is: 136.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.92 : 152.77 = 90.87 : x
  2. Step 2: Convert to fraction form
    101.92/152.77 = 90.87/x
  3. Step 3: Cross multiply
    101.92x = 152.77 × 90.87
  4. Step 4: Simplify right side
    101.92x = 13,882.21
  5. Step 5: Solve for x
    x = 13,882.21/101.92
  6. Step 6: Final answer
    x = 136.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.