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Finding the Fourth Proportional to 79.89, 119.54 and 69.18

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Solution

The fourth proportional to 79.89, 119.54 and 69.18 is: 103.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.89 : 119.54 = 69.18 : x
  2. Step 2: Convert to fraction form
    79.89/119.54 = 69.18/x
  3. Step 3: Cross multiply
    79.89x = 119.54 × 69.18
  4. Step 4: Simplify right side
    79.89x = 8,269.55
  5. Step 5: Solve for x
    x = 8,269.55/79.89
  6. Step 6: Final answer
    x = 103.52

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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.