Home / 81,789.12-112,869-45,979.20

Finding the Fourth Proportional to 81,789.12, 112,869 and 45,979.20

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Solution

The fourth proportional to 81,789.12, 112,869 and 45,979.20 is: 63,451.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,789.12 : 112,869 = 45,979.20 : x
  2. Step 2: Convert to fraction form
    81,789.12/112,869 = 45,979.20/x
  3. Step 3: Cross multiply
    81,789.12x = 112,869 × 45,979.20
  4. Step 4: Simplify right side
    81,789.12x = 5,189,626,324.80
  5. Step 5: Solve for x
    x = 5,189,626,324.80/81,789.12
  6. Step 6: Final answer
    x = 63,451.30

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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.