Home / 20,891.28-28,833.66-12,398.09

Finding the Fourth Proportional to 20,891.28, 28,833.66 and 12,398.09

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Solution

The fourth proportional to 20,891.28, 28,833.66 and 12,398.09 is: 17,111.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.28 : 28,833.66 = 12,398.09 : x
  2. Step 2: Convert to fraction form
    20,891.28/28,833.66 = 12,398.09/x
  3. Step 3: Cross multiply
    20,891.28x = 28,833.66 × 12,398.09
  4. Step 4: Simplify right side
    20,891.28x = 357,482,311.71
  5. Step 5: Solve for x
    x = 357,482,311.71/20,891.28
  6. Step 6: Final answer
    x = 17,111.56

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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.