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Finding the Fourth Proportional to 99.42, 149.33 and 76.63

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Solution

The fourth proportional to 99.42, 149.33 and 76.63 is: 115.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.42 : 149.33 = 76.63 : x
  2. Step 2: Convert to fraction form
    99.42/149.33 = 76.63/x
  3. Step 3: Cross multiply
    99.42x = 149.33 × 76.63
  4. Step 4: Simplify right side
    99.42x = 11,443.16
  5. Step 5: Solve for x
    x = 11,443.16/99.42
  6. Step 6: Final answer
    x = 115.10

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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.