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Finding the Fourth Proportional to 122.18, 168.56 and 87.21

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Solution

The fourth proportional to 122.18, 168.56 and 87.21 is: 120.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.18 : 168.56 = 87.21 : x
  2. Step 2: Convert to fraction form
    122.18/168.56 = 87.21/x
  3. Step 3: Cross multiply
    122.18x = 168.56 × 87.21
  4. Step 4: Simplify right side
    122.18x = 14,700.12
  5. Step 5: Solve for x
    x = 14,700.12/122.18
  6. Step 6: Final answer
    x = 120.32

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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.