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Finding the Fourth Proportional to 122,487.72, 168,989.38 and 77,169.80

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Solution

The fourth proportional to 122,487.72, 168,989.38 and 77,169.80 is: 106,466.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,487.72 : 168,989.38 = 77,169.80 : x
  2. Step 2: Convert to fraction form
    122,487.72/168,989.38 = 77,169.80/x
  3. Step 3: Cross multiply
    122,487.72x = 168,989.38 × 77,169.80
  4. Step 4: Simplify right side
    122,487.72x = 13,040,876,656.72
  5. Step 5: Solve for x
    x = 13,040,876,656.72/122,487.72
  6. Step 6: Final answer
    x = 106,466.81

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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.