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Finding the Fourth Proportional to 76.26, 114.31 and 28.15

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Solution

The fourth proportional to 76.26, 114.31 and 28.15 is: 42.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.26 : 114.31 = 28.15 : x
  2. Step 2: Convert to fraction form
    76.26/114.31 = 28.15/x
  3. Step 3: Cross multiply
    76.26x = 114.31 × 28.15
  4. Step 4: Simplify right side
    76.26x = 3,217.83
  5. Step 5: Solve for x
    x = 3,217.83/76.26
  6. Step 6: Final answer
    x = 42.20

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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.