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Finding the Fourth Proportional to 76.08, 114.78 and 73.92

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Solution

The fourth proportional to 76.08, 114.78 and 73.92 is: 111.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.08 : 114.78 = 73.92 : x
  2. Step 2: Convert to fraction form
    76.08/114.78 = 73.92/x
  3. Step 3: Cross multiply
    76.08x = 114.78 × 73.92
  4. Step 4: Simplify right side
    76.08x = 8,484.54
  5. Step 5: Solve for x
    x = 8,484.54/76.08
  6. Step 6: Final answer
    x = 111.52

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.