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Finding the Fourth Proportional to 99.08, 136.78 and 59.76

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Solution

The fourth proportional to 99.08, 136.78 and 59.76 is: 82.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.08 : 136.78 = 59.76 : x
  2. Step 2: Convert to fraction form
    99.08/136.78 = 59.76/x
  3. Step 3: Cross multiply
    99.08x = 136.78 × 59.76
  4. Step 4: Simplify right side
    99.08x = 8,173.97
  5. Step 5: Solve for x
    x = 8,173.97/99.08
  6. Step 6: Final answer
    x = 82.50

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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.