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Finding the Fourth Proportional to 99.11, 148.92 and 86.35

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Solution

The fourth proportional to 99.11, 148.92 and 86.35 is: 129.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.11 : 148.92 = 86.35 : x
  2. Step 2: Convert to fraction form
    99.11/148.92 = 86.35/x
  3. Step 3: Cross multiply
    99.11x = 148.92 × 86.35
  4. Step 4: Simplify right side
    99.11x = 12,859.24
  5. Step 5: Solve for x
    x = 12,859.24/99.11
  6. Step 6: Final answer
    x = 129.75

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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.