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Finding the Fourth Proportional to 111.15, 166.61 and 59.69

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Solution

The fourth proportional to 111.15, 166.61 and 59.69 is: 89.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.15 : 166.61 = 59.69 : x
  2. Step 2: Convert to fraction form
    111.15/166.61 = 59.69/x
  3. Step 3: Cross multiply
    111.15x = 166.61 × 59.69
  4. Step 4: Simplify right side
    111.15x = 9,945.52
  5. Step 5: Solve for x
    x = 9,945.52/111.15
  6. Step 6: Final answer
    x = 89.48

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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.