Home / 20,818.48-28,729.50-11,387.02

Finding the Fourth Proportional to 20,818.48, 28,729.50 and 11,387.02

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Solution

The fourth proportional to 20,818.48, 28,729.50 and 11,387.02 is: 15,714.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.48 : 28,729.50 = 11,387.02 : x
  2. Step 2: Convert to fraction form
    20,818.48/28,729.50 = 11,387.02/x
  3. Step 3: Cross multiply
    20,818.48x = 28,729.50 × 11,387.02
  4. Step 4: Simplify right side
    20,818.48x = 327,143,391.09
  5. Step 5: Solve for x
    x = 327,143,391.09/20,818.48
  6. Step 6: Final answer
    x = 15,714.09

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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.