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Finding the Fourth Proportional to 76.81, 114.60 and 71.57

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Solution

The fourth proportional to 76.81, 114.60 and 71.57 is: 106.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.81 : 114.60 = 71.57 : x
  2. Step 2: Convert to fraction form
    76.81/114.60 = 71.57/x
  3. Step 3: Cross multiply
    76.81x = 114.60 × 71.57
  4. Step 4: Simplify right side
    76.81x = 8,201.92
  5. Step 5: Solve for x
    x = 8,201.92/76.81
  6. Step 6: Final answer
    x = 106.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.