Home / 20,818.80-28,729.71-11,387.25

Finding the Fourth Proportional to 20,818.80, 28,729.71 and 11,387.25

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Solution

The fourth proportional to 20,818.80, 28,729.71 and 11,387.25 is: 15,714.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.80 : 28,729.71 = 11,387.25 : x
  2. Step 2: Convert to fraction form
    20,818.80/28,729.71 = 11,387.25/x
  3. Step 3: Cross multiply
    20,818.80x = 28,729.71 × 11,387.25
  4. Step 4: Simplify right side
    20,818.80x = 327,152,390.20
  5. Step 5: Solve for x
    x = 327,152,390.20/20,818.80
  6. Step 6: Final answer
    x = 15,714.28

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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.