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Finding the Fourth Proportional to 99.45, 149.20 and 45.38

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Solution

The fourth proportional to 99.45, 149.20 and 45.38 is: 68.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.45 : 149.20 = 45.38 : x
  2. Step 2: Convert to fraction form
    99.45/149.20 = 45.38/x
  3. Step 3: Cross multiply
    99.45x = 149.20 × 45.38
  4. Step 4: Simplify right side
    99.45x = 6,770.68
  5. Step 5: Solve for x
    x = 6,770.68/99.45
  6. Step 6: Final answer
    x = 68.08

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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.