Home / 20,555.38-28,367.45-12,489.10

Finding the Fourth Proportional to 20,555.38, 28,367.45 and 12,489.10

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Solution

The fourth proportional to 20,555.38, 28,367.45 and 12,489.10 is: 17,235.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,555.38 : 28,367.45 = 12,489.10 : x
  2. Step 2: Convert to fraction form
    20,555.38/28,367.45 = 12,489.10/x
  3. Step 3: Cross multiply
    20,555.38x = 28,367.45 × 12,489.10
  4. Step 4: Simplify right side
    20,555.38x = 354,283,833.27
  5. Step 5: Solve for x
    x = 354,283,833.27/20,555.38
  6. Step 6: Final answer
    x = 17,235.58

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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.