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Finding the Fourth Proportional to 122,685.42, 169,311.88 and 68,987.28

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Solution

The fourth proportional to 122,685.42, 169,311.88 and 68,987.28 is: 95,205.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,685.42 : 169,311.88 = 68,987.28 : x
  2. Step 2: Convert to fraction form
    122,685.42/169,311.88 = 68,987.28/x
  3. Step 3: Cross multiply
    122,685.42x = 169,311.88 × 68,987.28
  4. Step 4: Simplify right side
    122,685.42x = 11,680,366,072.89
  5. Step 5: Solve for x
    x = 11,680,366,072.89/122,685.42
  6. Step 6: Final answer
    x = 95,205.82

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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.