Home / 81,964.90-122,947.35-81,187.30

Finding the Fourth Proportional to 81,964.90, 122,947.35 and 81,187.30

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Solution

The fourth proportional to 81,964.90, 122,947.35 and 81,187.30 is: 121,780.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,964.90 : 122,947.35 = 81,187.30 : x
  2. Step 2: Convert to fraction form
    81,964.90/122,947.35 = 81,187.30/x
  3. Step 3: Cross multiply
    81,964.90x = 122,947.35 × 81,187.30
  4. Step 4: Simplify right side
    81,964.90x = 9,981,763,388.66
  5. Step 5: Solve for x
    x = 9,981,763,388.66/81,964.90
  6. Step 6: Final answer
    x = 121,780.95

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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.