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Finding the Fourth Proportional to 79.18, 118 and 76.88

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Solution

The fourth proportional to 79.18, 118 and 76.88 is: 114.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.18 : 118 = 76.88 : x
  2. Step 2: Convert to fraction form
    79.18/118 = 76.88/x
  3. Step 3: Cross multiply
    79.18x = 118 × 76.88
  4. Step 4: Simplify right side
    79.18x = 9,071.84
  5. Step 5: Solve for x
    x = 9,071.84/79.18
  6. Step 6: Final answer
    x = 114.57

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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.