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Finding the Fourth Proportional to 99.20, 136.73 and 90.83

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Solution

The fourth proportional to 99.20, 136.73 and 90.83 is: 125.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.20 : 136.73 = 90.83 : x
  2. Step 2: Convert to fraction form
    99.20/136.73 = 90.83/x
  3. Step 3: Cross multiply
    99.20x = 136.73 × 90.83
  4. Step 4: Simplify right side
    99.20x = 12,418.05
  5. Step 5: Solve for x
    x = 12,418.05/99.20
  6. Step 6: Final answer
    x = 125.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.