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Finding the Fourth Proportional to 99.49, 149.15 and 45.31

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Solution

The fourth proportional to 99.49, 149.15 and 45.31 is: 67.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.49 : 149.15 = 45.31 : x
  2. Step 2: Convert to fraction form
    99.49/149.15 = 45.31/x
  3. Step 3: Cross multiply
    99.49x = 149.15 × 45.31
  4. Step 4: Simplify right side
    99.49x = 6,757.76
  5. Step 5: Solve for x
    x = 6,757.76/99.49
  6. Step 6: Final answer
    x = 67.92

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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.