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Finding the Fourth Proportional to 81,257.80, 121,886.70 and 72,704.20

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Solution

The fourth proportional to 81,257.80, 121,886.70 and 72,704.20 is: 109,056.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,257.80 : 121,886.70 = 72,704.20 : x
  2. Step 2: Convert to fraction form
    81,257.80/121,886.70 = 72,704.20/x
  3. Step 3: Cross multiply
    81,257.80x = 121,886.70 × 72,704.20
  4. Step 4: Simplify right side
    81,257.80x = 8,861,675,014.14
  5. Step 5: Solve for x
    x = 8,861,675,014.14/81,257.80
  6. Step 6: Final answer
    x = 109,056.30

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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.