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Finding the Fourth Proportional to 76.18, 114.33 and 72.70

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Solution

The fourth proportional to 76.18, 114.33 and 72.70 is: 109.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.18 : 114.33 = 72.70 : x
  2. Step 2: Convert to fraction form
    76.18/114.33 = 72.70/x
  3. Step 3: Cross multiply
    76.18x = 114.33 × 72.70
  4. Step 4: Simplify right side
    76.18x = 8,311.79
  5. Step 5: Solve for x
    x = 8,311.79/76.18
  6. Step 6: Final answer
    x = 109.11

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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.