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Finding the Fourth Proportional to 86,251.80, 129,256.20 and 68,512.80

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Solution

The fourth proportional to 86,251.80, 129,256.20 and 68,512.80 is: 102,672.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,251.80 : 129,256.20 = 68,512.80 : x
  2. Step 2: Convert to fraction form
    86,251.80/129,256.20 = 68,512.80/x
  3. Step 3: Cross multiply
    86,251.80x = 129,256.20 × 68,512.80
  4. Step 4: Simplify right side
    86,251.80x = 8,855,704,179.36
  5. Step 5: Solve for x
    x = 8,855,704,179.36/86,251.80
  6. Step 6: Final answer
    x = 102,672.69

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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.