Home / 80,945.60-121,418.40-72,489.20

Finding the Fourth Proportional to 80,945.60, 121,418.40 and 72,489.20

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Solution

The fourth proportional to 80,945.60, 121,418.40 and 72,489.20 is: 108,733.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,945.60 : 121,418.40 = 72,489.20 : x
  2. Step 2: Convert to fraction form
    80,945.60/121,418.40 = 72,489.20/x
  3. Step 3: Cross multiply
    80,945.60x = 121,418.40 × 72,489.20
  4. Step 4: Simplify right side
    80,945.60x = 8,801,522,681.28
  5. Step 5: Solve for x
    x = 8,801,522,681.28/80,945.60
  6. Step 6: Final answer
    x = 108,733.80

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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.