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Finding the Fourth Proportional to 99.20, 136.86 and 61.34

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Solution

The fourth proportional to 99.20, 136.86 and 61.34 is: 84.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.20 : 136.86 = 61.34 : x
  2. Step 2: Convert to fraction form
    99.20/136.86 = 61.34/x
  3. Step 3: Cross multiply
    99.20x = 136.86 × 61.34
  4. Step 4: Simplify right side
    99.20x = 8,394.99
  5. Step 5: Solve for x
    x = 8,394.99/99.20
  6. Step 6: Final answer
    x = 84.63

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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.