Home / 20,644.20-28,488.78-11,691.54

Finding the Fourth Proportional to 20,644.20, 28,488.78 and 11,691.54

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Solution

The fourth proportional to 20,644.20, 28,488.78 and 11,691.54 is: 16,134.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,644.20 : 28,488.78 = 11,691.54 : x
  2. Step 2: Convert to fraction form
    20,644.20/28,488.78 = 11,691.54/x
  3. Step 3: Cross multiply
    20,644.20x = 28,488.78 × 11,691.54
  4. Step 4: Simplify right side
    20,644.20x = 333,077,710.92
  5. Step 5: Solve for x
    x = 333,077,710.92/20,644.20
  6. Step 6: Final answer
    x = 16,134.20

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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.