Home / 81,267.20-121,900.80-68,436.80

Finding the Fourth Proportional to 81,267.20, 121,900.80 and 68,436.80

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Solution

The fourth proportional to 81,267.20, 121,900.80 and 68,436.80 is: 102,655.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,267.20 : 121,900.80 = 68,436.80 : x
  2. Step 2: Convert to fraction form
    81,267.20/121,900.80 = 68,436.80/x
  3. Step 3: Cross multiply
    81,267.20x = 121,900.80 × 68,436.80
  4. Step 4: Simplify right side
    81,267.20x = 8,342,500,669.44
  5. Step 5: Solve for x
    x = 8,342,500,669.44/81,267.20
  6. Step 6: Final answer
    x = 102,655.20

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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.