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Finding the Fourth Proportional to 122.32, 168.72 and 119.68

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Solution

The fourth proportional to 122.32, 168.72 and 119.68 is: 165.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.32 : 168.72 = 119.68 : x
  2. Step 2: Convert to fraction form
    122.32/168.72 = 119.68/x
  3. Step 3: Cross multiply
    122.32x = 168.72 × 119.68
  4. Step 4: Simplify right side
    122.32x = 20,192.41
  5. Step 5: Solve for x
    x = 20,192.41/122.32
  6. Step 6: Final answer
    x = 165.08

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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.