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Finding the Fourth Proportional to 79.92, 120.56 and 78.24

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Solution

The fourth proportional to 79.92, 120.56 and 78.24 is: 118.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.92 : 120.56 = 78.24 : x
  2. Step 2: Convert to fraction form
    79.92/120.56 = 78.24/x
  3. Step 3: Cross multiply
    79.92x = 120.56 × 78.24
  4. Step 4: Simplify right side
    79.92x = 9,432.61
  5. Step 5: Solve for x
    x = 9,432.61/79.92
  6. Step 6: Final answer
    x = 118.03

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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.