Home / 81,010.20-121,515.30-77,729.70

Finding the Fourth Proportional to 81,010.20, 121,515.30 and 77,729.70

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Solution

The fourth proportional to 81,010.20, 121,515.30 and 77,729.70 is: 116,594.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,010.20 : 121,515.30 = 77,729.70 : x
  2. Step 2: Convert to fraction form
    81,010.20/121,515.30 = 77,729.70/x
  3. Step 3: Cross multiply
    81,010.20x = 121,515.30 × 77,729.70
  4. Step 4: Simplify right side
    81,010.20x = 9,445,347,814.41
  5. Step 5: Solve for x
    x = 9,445,347,814.41/81,010.20
  6. Step 6: Final answer
    x = 116,594.55

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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.