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Finding the Fourth Proportional to 100.79, 151.25 and 39.89

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Solution

The fourth proportional to 100.79, 151.25 and 39.89 is: 59.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.79 : 151.25 = 39.89 : x
  2. Step 2: Convert to fraction form
    100.79/151.25 = 39.89/x
  3. Step 3: Cross multiply
    100.79x = 151.25 × 39.89
  4. Step 4: Simplify right side
    100.79x = 6,032.41
  5. Step 5: Solve for x
    x = 6,032.41/100.79
  6. Step 6: Final answer
    x = 59.85

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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.