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Finding the Fourth Proportional to 99.38, 148.87 and 51.30

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Solution

The fourth proportional to 99.38, 148.87 and 51.30 is: 76.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.38 : 148.87 = 51.30 : x
  2. Step 2: Convert to fraction form
    99.38/148.87 = 51.30/x
  3. Step 3: Cross multiply
    99.38x = 148.87 × 51.30
  4. Step 4: Simplify right side
    99.38x = 7,637.03
  5. Step 5: Solve for x
    x = 7,637.03/99.38
  6. Step 6: Final answer
    x = 76.85

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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.