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Finding the Fourth Proportional to 80,999.60, 121,446.60 and 72,705.20

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Solution

The fourth proportional to 80,999.60, 121,446.60 and 72,705.20 is: 109,010.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,999.60 : 121,446.60 = 72,705.20 : x
  2. Step 2: Convert to fraction form
    80,999.60/121,446.60 = 72,705.20/x
  3. Step 3: Cross multiply
    80,999.60x = 121,446.60 × 72,705.20
  4. Step 4: Simplify right side
    80,999.60x = 8,829,799,342.32
  5. Step 5: Solve for x
    x = 8,829,799,342.32/80,999.60
  6. Step 6: Final answer
    x = 109,010.41

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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.