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Finding the Fourth Proportional to 81,193.80, 121,809.90 and 25,789.80

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Solution

The fourth proportional to 81,193.80, 121,809.90 and 25,789.80 is: 38,690.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,193.80 : 121,809.90 = 25,789.80 : x
  2. Step 2: Convert to fraction form
    81,193.80/121,809.90 = 25,789.80/x
  3. Step 3: Cross multiply
    81,193.80x = 121,809.90 × 25,789.80
  4. Step 4: Simplify right side
    81,193.80x = 3,141,452,959.02
  5. Step 5: Solve for x
    x = 3,141,452,959.02/81,193.80
  6. Step 6: Final answer
    x = 38,690.80

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1.5x scale

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.