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Finding the Fourth Proportional to 122.72, 169.32 and 79.08

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Solution

The fourth proportional to 122.72, 169.32 and 79.08 is: 109.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.72 : 169.32 = 79.08 : x
  2. Step 2: Convert to fraction form
    122.72/169.32 = 79.08/x
  3. Step 3: Cross multiply
    122.72x = 169.32 × 79.08
  4. Step 4: Simplify right side
    122.72x = 13,390.45
  5. Step 5: Solve for x
    x = 13,390.45/122.72
  6. Step 6: Final answer
    x = 109.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.