Home / 81,684.12-112,641.12-76,921.80

Finding the Fourth Proportional to 81,684.12, 112,641.12 and 76,921.80

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Solution

The fourth proportional to 81,684.12, 112,641.12 and 76,921.80 is: 106,073.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,684.12 : 112,641.12 = 76,921.80 : x
  2. Step 2: Convert to fraction form
    81,684.12/112,641.12 = 76,921.80/x
  3. Step 3: Cross multiply
    81,684.12x = 112,641.12 × 76,921.80
  4. Step 4: Simplify right side
    81,684.12x = 8,664,557,704.42
  5. Step 5: Solve for x
    x = 8,664,557,704.42/81,684.12
  6. Step 6: Final answer
    x = 106,073.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.