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Finding the Fourth Proportional to 99.31, 148.95 and 45.20

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Solution

The fourth proportional to 99.31, 148.95 and 45.20 is: 67.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.31 : 148.95 = 45.20 : x
  2. Step 2: Convert to fraction form
    99.31/148.95 = 45.20/x
  3. Step 3: Cross multiply
    99.31x = 148.95 × 45.20
  4. Step 4: Simplify right side
    99.31x = 6,731.92
  5. Step 5: Solve for x
    x = 6,731.92/99.31
  6. Step 6: Final answer
    x = 67.78

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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.