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Finding the Fourth Proportional to 76.20, 114.92 and 75.20

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Solution

The fourth proportional to 76.20, 114.92 and 75.20 is: 113.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.20 : 114.92 = 75.20 : x
  2. Step 2: Convert to fraction form
    76.20/114.92 = 75.20/x
  3. Step 3: Cross multiply
    76.20x = 114.92 × 75.20
  4. Step 4: Simplify right side
    76.20x = 8,641.98
  5. Step 5: Solve for x
    x = 8,641.98/76.20
  6. Step 6: Final answer
    x = 113.41

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