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Finding the Fourth Proportional to 99.87, 149.55 and 74.21

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Solution

The fourth proportional to 99.87, 149.55 and 74.21 is: 111.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.87 : 149.55 = 74.21 : x
  2. Step 2: Convert to fraction form
    99.87/149.55 = 74.21/x
  3. Step 3: Cross multiply
    99.87x = 149.55 × 74.21
  4. Step 4: Simplify right side
    99.87x = 11,098.11
  5. Step 5: Solve for x
    x = 11,098.11/99.87
  6. Step 6: Final answer
    x = 111.13

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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.