Home / 20,818.77-28,729.31-11,387.13

Finding the Fourth Proportional to 20,818.77, 28,729.31 and 11,387.13

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Solution

The fourth proportional to 20,818.77, 28,729.31 and 11,387.13 is: 15,713.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.77 : 28,729.31 = 11,387.13 : x
  2. Step 2: Convert to fraction form
    20,818.77/28,729.31 = 11,387.13/x
  3. Step 3: Cross multiply
    20,818.77x = 28,729.31 × 11,387.13
  4. Step 4: Simplify right side
    20,818.77x = 327,144,387.78
  5. Step 5: Solve for x
    x = 327,144,387.78/20,818.77
  6. Step 6: Final answer
    x = 15,713.92

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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.