Home / 20,818.71-28,730.50-11,387.27

Finding the Fourth Proportional to 20,818.71, 28,730.50 and 11,387.27

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Solution

The fourth proportional to 20,818.71, 28,730.50 and 11,387.27 is: 15,714.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.71 : 28,730.50 = 11,387.27 : x
  2. Step 2: Convert to fraction form
    20,818.71/28,730.50 = 11,387.27/x
  3. Step 3: Cross multiply
    20,818.71x = 28,730.50 × 11,387.27
  4. Step 4: Simplify right side
    20,818.71x = 327,162,004.09
  5. Step 5: Solve for x
    x = 327,162,004.09/20,818.71
  6. Step 6: Final answer
    x = 15,714.81

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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.