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Finding the Fourth Proportional to 122,701.78, 169,328.25 and 68,986.90

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Solution

The fourth proportional to 122,701.78, 169,328.25 and 68,986.90 is: 95,201.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,701.78 : 169,328.25 = 68,986.90 : x
  2. Step 2: Convert to fraction form
    122,701.78/169,328.25 = 68,986.90/x
  3. Step 3: Cross multiply
    122,701.78x = 169,328.25 × 68,986.90
  4. Step 4: Simplify right side
    122,701.78x = 11,681,431,049.93
  5. Step 5: Solve for x
    x = 11,681,431,049.93/122,701.78
  6. Step 6: Final answer
    x = 95,201.81

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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.