Home / 20,818.76-28,729.28-11,387.12

Finding the Fourth Proportional to 20,818.76, 28,729.28 and 11,387.12

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Solution

The fourth proportional to 20,818.76, 28,729.28 and 11,387.12 is: 15,713.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.76 : 28,729.28 = 11,387.12 : x
  2. Step 2: Convert to fraction form
    20,818.76/28,729.28 = 11,387.12/x
  3. Step 3: Cross multiply
    20,818.76x = 28,729.28 × 11,387.12
  4. Step 4: Simplify right side
    20,818.76x = 327,143,758.87
  5. Step 5: Solve for x
    x = 327,143,758.87/20,818.76
  6. Step 6: Final answer
    x = 15,713.89

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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.