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Finding the Fourth Proportional to 99.26, 148.91 and 76.34

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Solution

The fourth proportional to 99.26, 148.91 and 76.34 is: 114.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.26 : 148.91 = 76.34 : x
  2. Step 2: Convert to fraction form
    99.26/148.91 = 76.34/x
  3. Step 3: Cross multiply
    99.26x = 148.91 × 76.34
  4. Step 4: Simplify right side
    99.26x = 11,367.78
  5. Step 5: Solve for x
    x = 11,367.78/99.26
  6. Step 6: Final answer
    x = 114.53

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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.