Home / 20,879.10-28,819.26-12,918.42

Finding the Fourth Proportional to 20,879.10, 28,819.26 and 12,918.42

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Solution

The fourth proportional to 20,879.10, 28,819.26 and 12,918.42 is: 17,831.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.10 : 28,819.26 = 12,918.42 : x
  2. Step 2: Convert to fraction form
    20,879.10/28,819.26 = 12,918.42/x
  3. Step 3: Cross multiply
    20,879.10x = 28,819.26 × 12,918.42
  4. Step 4: Simplify right side
    20,879.10x = 372,299,304.77
  5. Step 5: Solve for x
    x = 372,299,304.77/20,879.10
  6. Step 6: Final answer
    x = 17,831.20

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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.