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Finding the Fourth Proportional to 81,279.60, 121,879.08 and 25,868.40

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Solution

The fourth proportional to 81,279.60, 121,879.08 and 25,868.40 is: 38,789.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,279.60 : 121,879.08 = 25,868.40 : x
  2. Step 2: Convert to fraction form
    81,279.60/121,879.08 = 25,868.40/x
  3. Step 3: Cross multiply
    81,279.60x = 121,879.08 × 25,868.40
  4. Step 4: Simplify right side
    81,279.60x = 3,152,816,793.07
  5. Step 5: Solve for x
    x = 3,152,816,793.07/81,279.60
  6. Step 6: Final answer
    x = 38,789.77

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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.