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Finding the Fourth Proportional to 99.27, 136.98 and 55.60

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Solution

The fourth proportional to 99.27, 136.98 and 55.60 is: 76.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.27 : 136.98 = 55.60 : x
  2. Step 2: Convert to fraction form
    99.27/136.98 = 55.60/x
  3. Step 3: Cross multiply
    99.27x = 136.98 × 55.60
  4. Step 4: Simplify right side
    99.27x = 7,615.75
  5. Step 5: Solve for x
    x = 7,615.75/99.27
  6. Step 6: Final answer
    x = 76.72

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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.