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Finding the Fourth Proportional to 158.96, 219.40 and 122.24

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Solution

The fourth proportional to 158.96, 219.40 and 122.24 is: 168.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.96 : 219.40 = 122.24 : x
  2. Step 2: Convert to fraction form
    158.96/219.40 = 122.24/x
  3. Step 3: Cross multiply
    158.96x = 219.40 × 122.24
  4. Step 4: Simplify right side
    158.96x = 26,819.46
  5. Step 5: Solve for x
    x = 26,819.46/158.96
  6. Step 6: Final answer
    x = 168.72

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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.