Home / 20,346.78-28,078.29-11,394.21

Finding the Fourth Proportional to 20,346.78, 28,078.29 and 11,394.21

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Solution

The fourth proportional to 20,346.78, 28,078.29 and 11,394.21 is: 15,723.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,346.78 : 28,078.29 = 11,394.21 : x
  2. Step 2: Convert to fraction form
    20,346.78/28,078.29 = 11,394.21/x
  3. Step 3: Cross multiply
    20,346.78x = 28,078.29 × 11,394.21
  4. Step 4: Simplify right side
    20,346.78x = 319,929,932.70
  5. Step 5: Solve for x
    x = 319,929,932.70/20,346.78
  6. Step 6: Final answer
    x = 15,723.86

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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.