Home / 20,862.92-28,789.88-11,431.28

Finding the Fourth Proportional to 20,862.92, 28,789.88 and 11,431.28

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Solution

The fourth proportional to 20,862.92, 28,789.88 and 11,431.28 is: 15,774.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,862.92 : 28,789.88 = 11,431.28 : x
  2. Step 2: Convert to fraction form
    20,862.92/28,789.88 = 11,431.28/x
  3. Step 3: Cross multiply
    20,862.92x = 28,789.88 × 11,431.28
  4. Step 4: Simplify right side
    20,862.92x = 329,105,179.45
  5. Step 5: Solve for x
    x = 329,105,179.45/20,862.92
  6. Step 6: Final answer
    x = 15,774.65

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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.