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Finding the Fourth Proportional to 79.53, 119.76 and 72.11

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Solution

The fourth proportional to 79.53, 119.76 and 72.11 is: 108.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.53 : 119.76 = 72.11 : x
  2. Step 2: Convert to fraction form
    79.53/119.76 = 72.11/x
  3. Step 3: Cross multiply
    79.53x = 119.76 × 72.11
  4. Step 4: Simplify right side
    79.53x = 8,635.29
  5. Step 5: Solve for x
    x = 8,635.29/79.53
  6. Step 6: Final answer
    x = 108.58

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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.