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Finding the Fourth Proportional to 76.60, 114.03 and 76.15

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Solution

The fourth proportional to 76.60, 114.03 and 76.15 is: 113.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.60 : 114.03 = 76.15 : x
  2. Step 2: Convert to fraction form
    76.60/114.03 = 76.15/x
  3. Step 3: Cross multiply
    76.60x = 114.03 × 76.15
  4. Step 4: Simplify right side
    76.60x = 8,683.38
  5. Step 5: Solve for x
    x = 8,683.38/76.60
  6. Step 6: Final answer
    x = 113.36

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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.