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Finding the Fourth Proportional to 109.52, 151.22 and 76.72

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Solution

The fourth proportional to 109.52, 151.22 and 76.72 is: 105.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.52 : 151.22 = 76.72 : x
  2. Step 2: Convert to fraction form
    109.52/151.22 = 76.72/x
  3. Step 3: Cross multiply
    109.52x = 151.22 × 76.72
  4. Step 4: Simplify right side
    109.52x = 11,601.60
  5. Step 5: Solve for x
    x = 11,601.60/109.52
  6. Step 6: Final answer
    x = 105.93

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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.