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Finding the Fourth Proportional to 121,651.64, 167,872.29 and 72,648.56

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Solution

The fourth proportional to 121,651.64, 167,872.29 and 72,648.56 is: 100,250.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,651.64 : 167,872.29 = 72,648.56 : x
  2. Step 2: Convert to fraction form
    121,651.64/167,872.29 = 72,648.56/x
  3. Step 3: Cross multiply
    121,651.64x = 167,872.29 × 72,648.56
  4. Step 4: Simplify right side
    121,651.64x = 12,195,680,132.40
  5. Step 5: Solve for x
    x = 12,195,680,132.40/121,651.64
  6. Step 6: Final answer
    x = 100,250.85

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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.