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Finding the Fourth Proportional to 111.52, 166.92 and 65.74

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Solution

The fourth proportional to 111.52, 166.92 and 65.74 is: 98.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.52 : 166.92 = 65.74 : x
  2. Step 2: Convert to fraction form
    111.52/166.92 = 65.74/x
  3. Step 3: Cross multiply
    111.52x = 166.92 × 65.74
  4. Step 4: Simplify right side
    111.52x = 10,973.32
  5. Step 5: Solve for x
    x = 10,973.32/111.52
  6. Step 6: Final answer
    x = 98.40

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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.