Home / 20,818.88-28,729.68-11,387.36

Finding the Fourth Proportional to 20,818.88, 28,729.68 and 11,387.36

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Solution

The fourth proportional to 20,818.88, 28,729.68 and 11,387.36 is: 15,714.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.88 : 28,729.68 = 11,387.36 : x
  2. Step 2: Convert to fraction form
    20,818.88/28,729.68 = 11,387.36/x
  3. Step 3: Cross multiply
    20,818.88x = 28,729.68 × 11,387.36
  4. Step 4: Simplify right side
    20,818.88x = 327,155,208.84
  5. Step 5: Solve for x
    x = 327,155,208.84/20,818.88
  6. Step 6: Final answer
    x = 15,714.35

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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.