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Finding the Fourth Proportional to 81.08, 121.66 and 59.88

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Solution

The fourth proportional to 81.08, 121.66 and 59.88 is: 89.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.08 : 121.66 = 59.88 : x
  2. Step 2: Convert to fraction form
    81.08/121.66 = 59.88/x
  3. Step 3: Cross multiply
    81.08x = 121.66 × 59.88
  4. Step 4: Simplify right side
    81.08x = 7,285.00
  5. Step 5: Solve for x
    x = 7,285.00/81.08
  6. Step 6: Final answer
    x = 89.85

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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.