Home / 20,712.78-28,582.86-12,659.90

Finding the Fourth Proportional to 20,712.78, 28,582.86 and 12,659.90

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Solution

The fourth proportional to 20,712.78, 28,582.86 and 12,659.90 is: 17,470.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,712.78 : 28,582.86 = 12,659.90 : x
  2. Step 2: Convert to fraction form
    20,712.78/28,582.86 = 12,659.90/x
  3. Step 3: Cross multiply
    20,712.78x = 28,582.86 × 12,659.90
  4. Step 4: Simplify right side
    20,712.78x = 361,856,149.31
  5. Step 5: Solve for x
    x = 361,856,149.31/20,712.78
  6. Step 6: Final answer
    x = 17,470.19

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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.