Home / 20,881.13-31,279.97-12,556.59

Finding the Fourth Proportional to 20,881.13, 31,279.97 and 12,556.59

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Solution

The fourth proportional to 20,881.13, 31,279.97 and 12,556.59 is: 18,809.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.13 : 31,279.97 = 12,556.59 : x
  2. Step 2: Convert to fraction form
    20,881.13/31,279.97 = 12,556.59/x
  3. Step 3: Cross multiply
    20,881.13x = 31,279.97 × 12,556.59
  4. Step 4: Simplify right side
    20,881.13x = 392,769,789.89
  5. Step 5: Solve for x
    x = 392,769,789.89/20,881.13
  6. Step 6: Final answer
    x = 18,809.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.