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Finding the Fourth Proportional to 101.80, 151.49 and 100.72

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Solution

The fourth proportional to 101.80, 151.49 and 100.72 is: 149.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.80 : 151.49 = 100.72 : x
  2. Step 2: Convert to fraction form
    101.80/151.49 = 100.72/x
  3. Step 3: Cross multiply
    101.80x = 151.49 × 100.72
  4. Step 4: Simplify right side
    101.80x = 15,258.07
  5. Step 5: Solve for x
    x = 15,258.07/101.80
  6. Step 6: Final answer
    x = 149.88

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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.