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Finding the Fourth Proportional to 99.61, 149.45 and 41.80

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Solution

The fourth proportional to 99.61, 149.45 and 41.80 is: 62.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.61 : 149.45 = 41.80 : x
  2. Step 2: Convert to fraction form
    99.61/149.45 = 41.80/x
  3. Step 3: Cross multiply
    99.61x = 149.45 × 41.80
  4. Step 4: Simplify right side
    99.61x = 6,247.34
  5. Step 5: Solve for x
    x = 6,247.34/99.61
  6. Step 6: Final answer
    x = 62.72

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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.