Home / 80,721.60-121,043.52-28,129.92

Finding the Fourth Proportional to 80,721.60, 121,043.52 and 28,129.92

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Solution

The fourth proportional to 80,721.60, 121,043.52 and 28,129.92 is: 42,181.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,721.60 : 121,043.52 = 28,129.92 : x
  2. Step 2: Convert to fraction form
    80,721.60/121,043.52 = 28,129.92/x
  3. Step 3: Cross multiply
    80,721.60x = 121,043.52 × 28,129.92
  4. Step 4: Simplify right side
    80,721.60x = 3,404,944,534.12
  5. Step 5: Solve for x
    x = 3,404,944,534.12/80,721.60
  6. Step 6: Final answer
    x = 42,181.33

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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.