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Finding the Fourth Proportional to 122,628.62, 169,242.52 and 68,915.90

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Solution

The fourth proportional to 122,628.62, 169,242.52 and 68,915.90 is: 95,112.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,628.62 : 169,242.52 = 68,915.90 : x
  2. Step 2: Convert to fraction form
    122,628.62/169,242.52 = 68,915.90/x
  3. Step 3: Cross multiply
    122,628.62x = 169,242.52 × 68,915.90
  4. Step 4: Simplify right side
    122,628.62x = 11,663,499,565.57
  5. Step 5: Solve for x
    x = 11,663,499,565.57/122,628.62
  6. Step 6: Final answer
    x = 95,112.38

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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.