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Finding the Fourth Proportional to 76.72, 114.23 and 75.91

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Solution

The fourth proportional to 76.72, 114.23 and 75.91 is: 113.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.72 : 114.23 = 75.91 : x
  2. Step 2: Convert to fraction form
    76.72/114.23 = 75.91/x
  3. Step 3: Cross multiply
    76.72x = 114.23 × 75.91
  4. Step 4: Simplify right side
    76.72x = 8,671.20
  5. Step 5: Solve for x
    x = 8,671.20/76.72
  6. Step 6: Final answer
    x = 113.02

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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.