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Finding the Fourth Proportional to 101.68, 152.49 and 40.80

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Solution

The fourth proportional to 101.68, 152.49 and 40.80 is: 61.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.68 : 152.49 = 40.80 : x
  2. Step 2: Convert to fraction form
    101.68/152.49 = 40.80/x
  3. Step 3: Cross multiply
    101.68x = 152.49 × 40.80
  4. Step 4: Simplify right side
    101.68x = 6,221.21
  5. Step 5: Solve for x
    x = 6,221.21/101.68
  6. Step 6: Final answer
    x = 61.18

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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.