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Finding the Fourth Proportional to 131,659.20, 197,488.80 and 80,920.80

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Solution

The fourth proportional to 131,659.20, 197,488.80 and 80,920.80 is: 121,381.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,659.20 : 197,488.80 = 80,920.80 : x
  2. Step 2: Convert to fraction form
    131,659.20/197,488.80 = 80,920.80/x
  3. Step 3: Cross multiply
    131,659.20x = 197,488.80 × 80,920.80
  4. Step 4: Simplify right side
    131,659.20x = 15,980,951,687.04
  5. Step 5: Solve for x
    x = 15,980,951,687.04/131,659.20
  6. Step 6: Final answer
    x = 121,381.20

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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.