Home / 80,889.60-121,334.40-66,892.80

Finding the Fourth Proportional to 80,889.60, 121,334.40 and 66,892.80

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Solution

The fourth proportional to 80,889.60, 121,334.40 and 66,892.80 is: 100,339.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,889.60 : 121,334.40 = 66,892.80 : x
  2. Step 2: Convert to fraction form
    80,889.60/121,334.40 = 66,892.80/x
  3. Step 3: Cross multiply
    80,889.60x = 121,334.40 × 66,892.80
  4. Step 4: Simplify right side
    80,889.60x = 8,116,397,752.32
  5. Step 5: Solve for x
    x = 8,116,397,752.32/80,889.60
  6. Step 6: Final answer
    x = 100,339.20

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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.