Home / 28,479.12-42,694.40-20,132.88

Finding the Fourth Proportional to 28,479.12, 42,694.40 and 20,132.88

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Solution

The fourth proportional to 28,479.12, 42,694.40 and 20,132.88 is: 30,182.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,479.12 : 42,694.40 = 20,132.88 : x
  2. Step 2: Convert to fraction form
    28,479.12/42,694.40 = 20,132.88/x
  3. Step 3: Cross multiply
    28,479.12x = 42,694.40 × 20,132.88
  4. Step 4: Simplify right side
    28,479.12x = 859,561,231.87
  5. Step 5: Solve for x
    x = 859,561,231.87/28,479.12
  6. Step 6: Final answer
    x = 30,182.16

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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.