Home / 20,439.38-28,206.09-11,488.40

Finding the Fourth Proportional to 20,439.38, 28,206.09 and 11,488.40

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Solution

The fourth proportional to 20,439.38, 28,206.09 and 11,488.40 is: 15,853.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,439.38 : 28,206.09 = 11,488.40 : x
  2. Step 2: Convert to fraction form
    20,439.38/28,206.09 = 11,488.40/x
  3. Step 3: Cross multiply
    20,439.38x = 28,206.09 × 11,488.40
  4. Step 4: Simplify right side
    20,439.38x = 324,042,809.10
  5. Step 5: Solve for x
    x = 324,042,809.10/20,439.38
  6. Step 6: Final answer
    x = 15,853.85

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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.