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Finding the Fourth Proportional to 100.80, 151.16 and 39.89

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Solution

The fourth proportional to 100.80, 151.16 and 39.89 is: 59.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.80 : 151.16 = 39.89 : x
  2. Step 2: Convert to fraction form
    100.80/151.16 = 39.89/x
  3. Step 3: Cross multiply
    100.80x = 151.16 × 39.89
  4. Step 4: Simplify right side
    100.80x = 6,028.82
  5. Step 5: Solve for x
    x = 6,028.82/100.80
  6. Step 6: Final answer
    x = 59.81

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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.