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Finding the Fourth Proportional to 122.40, 167.88 and 116.76

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Solution

The fourth proportional to 122.40, 167.88 and 116.76 is: 160.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.40 : 167.88 = 116.76 : x
  2. Step 2: Convert to fraction form
    122.40/167.88 = 116.76/x
  3. Step 3: Cross multiply
    122.40x = 167.88 × 116.76
  4. Step 4: Simplify right side
    122.40x = 19,601.67
  5. Step 5: Solve for x
    x = 19,601.67/122.40
  6. Step 6: Final answer
    x = 160.14

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.