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Finding the Fourth Proportional to 81,810.60, 122,543.10 and 67,986.60

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Solution

The fourth proportional to 81,810.60, 122,543.10 and 67,986.60 is: 101,836.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,810.60 : 122,543.10 = 67,986.60 : x
  2. Step 2: Convert to fraction form
    81,810.60/122,543.10 = 67,986.60/x
  3. Step 3: Cross multiply
    81,810.60x = 122,543.10 × 67,986.60
  4. Step 4: Simplify right side
    81,810.60x = 8,331,288,722.46
  5. Step 5: Solve for x
    x = 8,331,288,722.46/81,810.60
  6. Step 6: Final answer
    x = 101,836.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.