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Finding the Fourth Proportional to 81,099.40, 121,655.25 and 21,934.20

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Solution

The fourth proportional to 81,099.40, 121,655.25 and 21,934.20 is: 32,902.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,099.40 : 121,655.25 = 21,934.20 : x
  2. Step 2: Convert to fraction form
    81,099.40/121,655.25 = 21,934.20/x
  3. Step 3: Cross multiply
    81,099.40x = 121,655.25 × 21,934.20
  4. Step 4: Simplify right side
    81,099.40x = 2,668,410,584.55
  5. Step 5: Solve for x
    x = 2,668,410,584.55/81,099.40
  6. Step 6: Final answer
    x = 32,902.96

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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.