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Finding the Fourth Proportional to 80,991.60, 121,434.60 and 72,697.20

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Solution

The fourth proportional to 80,991.60, 121,434.60 and 72,697.20 is: 108,998.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,991.60 : 121,434.60 = 72,697.20 : x
  2. Step 2: Convert to fraction form
    80,991.60/121,434.60 = 72,697.20/x
  3. Step 3: Cross multiply
    80,991.60x = 121,434.60 × 72,697.20
  4. Step 4: Simplify right side
    80,991.60x = 8,827,955,403.12
  5. Step 5: Solve for x
    x = 8,827,955,403.12/80,991.60
  6. Step 6: Final answer
    x = 108,998.41

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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.