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Finding the Fourth Proportional to 76.15, 114.76 and 72.49

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Solution

The fourth proportional to 76.15, 114.76 and 72.49 is: 109.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.15 : 114.76 = 72.49 : x
  2. Step 2: Convert to fraction form
    76.15/114.76 = 72.49/x
  3. Step 3: Cross multiply
    76.15x = 114.76 × 72.49
  4. Step 4: Simplify right side
    76.15x = 8,318.95
  5. Step 5: Solve for x
    x = 8,318.95/76.15
  6. Step 6: Final answer
    x = 109.24

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Why These Related Problems?

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