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Finding the Fourth Proportional to 81,641.40, 122,462.10 and 80,863.80

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Solution

The fourth proportional to 81,641.40, 122,462.10 and 80,863.80 is: 121,295.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,641.40 : 122,462.10 = 80,863.80 : x
  2. Step 2: Convert to fraction form
    81,641.40/122,462.10 = 80,863.80/x
  3. Step 3: Cross multiply
    81,641.40x = 122,462.10 × 80,863.80
  4. Step 4: Simplify right side
    81,641.40x = 9,902,750,761.98
  5. Step 5: Solve for x
    x = 9,902,750,761.98/81,641.40
  6. Step 6: Final answer
    x = 121,295.70

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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.