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Finding the Fourth Proportional to 76.57, 114.85 and 28.47

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Solution

The fourth proportional to 76.57, 114.85 and 28.47 is: 42.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.57 : 114.85 = 28.47 : x
  2. Step 2: Convert to fraction form
    76.57/114.85 = 28.47/x
  3. Step 3: Cross multiply
    76.57x = 114.85 × 28.47
  4. Step 4: Simplify right side
    76.57x = 3,269.78
  5. Step 5: Solve for x
    x = 3,269.78/76.57
  6. Step 6: Final answer
    x = 42.70

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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.