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Finding the Fourth Proportional to 122,438.86, 168,952.66 and 68,729.78

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Solution

The fourth proportional to 122,438.86, 168,952.66 and 68,729.78 is: 94,839.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,438.86 : 168,952.66 = 68,729.78 : x
  2. Step 2: Convert to fraction form
    122,438.86/168,952.66 = 68,729.78/x
  3. Step 3: Cross multiply
    122,438.86x = 168,952.66 × 68,729.78
  4. Step 4: Simplify right side
    122,438.86x = 11,612,079,402.77
  5. Step 5: Solve for x
    x = 11,612,079,402.77/122,438.86
  6. Step 6: Final answer
    x = 94,839.82

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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.