Home / 20,078.90-27,708.15-11,581.38

Finding the Fourth Proportional to 20,078.90, 27,708.15 and 11,581.38

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Solution

The fourth proportional to 20,078.90, 27,708.15 and 11,581.38 is: 15,981.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,078.90 : 27,708.15 = 11,581.38 : x
  2. Step 2: Convert to fraction form
    20,078.90/27,708.15 = 11,581.38/x
  3. Step 3: Cross multiply
    20,078.90x = 27,708.15 × 11,581.38
  4. Step 4: Simplify right side
    20,078.90x = 320,898,417.80
  5. Step 5: Solve for x
    x = 320,898,417.80/20,078.90
  6. Step 6: Final answer
    x = 15,981.88

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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.