Home / 20,891.38-28,827.76-12,390.44

Finding the Fourth Proportional to 20,891.38, 28,827.76 and 12,390.44

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Solution

The fourth proportional to 20,891.38, 28,827.76 and 12,390.44 is: 17,097.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.38 : 28,827.76 = 12,390.44 : x
  2. Step 2: Convert to fraction form
    20,891.38/28,827.76 = 12,390.44/x
  3. Step 3: Cross multiply
    20,891.38x = 28,827.76 × 12,390.44
  4. Step 4: Simplify right side
    20,891.38x = 357,188,630.61
  5. Step 5: Solve for x
    x = 357,188,630.61/20,891.38
  6. Step 6: Final answer
    x = 17,097.42

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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.