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Finding the Fourth Proportional to 100.61, 150.92 and 39.76

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Solution

The fourth proportional to 100.61, 150.92 and 39.76 is: 59.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.61 : 150.92 = 39.76 : x
  2. Step 2: Convert to fraction form
    100.61/150.92 = 39.76/x
  3. Step 3: Cross multiply
    100.61x = 150.92 × 39.76
  4. Step 4: Simplify right side
    100.61x = 6,000.30
  5. Step 5: Solve for x
    x = 6,000.30/100.61
  6. Step 6: Final answer
    x = 59.64

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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.