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Finding the Fourth Proportional to 81,259.74, 121,594.05 and 67,087.98

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Solution

The fourth proportional to 81,259.74, 121,594.05 and 67,087.98 is: 100,387.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,259.74 : 121,594.05 = 67,087.98 : x
  2. Step 2: Convert to fraction form
    81,259.74/121,594.05 = 67,087.98/x
  3. Step 3: Cross multiply
    81,259.74x = 121,594.05 × 67,087.98
  4. Step 4: Simplify right side
    81,259.74x = 8,157,499,194.52
  5. Step 5: Solve for x
    x = 8,157,499,194.52/81,259.74
  6. Step 6: Final answer
    x = 100,387.96

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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.