Home / 20,818.14-28,729.45-11,387.31

Finding the Fourth Proportional to 20,818.14, 28,729.45 and 11,387.31

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Solution

The fourth proportional to 20,818.14, 28,729.45 and 11,387.31 is: 15,714.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.14 : 28,729.45 = 11,387.31 : x
  2. Step 2: Convert to fraction form
    20,818.14/28,729.45 = 11,387.31/x
  3. Step 3: Cross multiply
    20,818.14x = 28,729.45 × 11,387.31
  4. Step 4: Simplify right side
    20,818.14x = 327,151,153.28
  5. Step 5: Solve for x
    x = 327,151,153.28/20,818.14
  6. Step 6: Final answer
    x = 15,714.72

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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.