Home / 20,862.78-28,791.30-11,431.92

Finding the Fourth Proportional to 20,862.78, 28,791.30 and 11,431.92

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Solution

The fourth proportional to 20,862.78, 28,791.30 and 11,431.92 is: 15,776.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,862.78 : 28,791.30 = 11,431.92 : x
  2. Step 2: Convert to fraction form
    20,862.78/28,791.30 = 11,431.92/x
  3. Step 3: Cross multiply
    20,862.78x = 28,791.30 × 11,431.92
  4. Step 4: Simplify right side
    20,862.78x = 329,139,838.30
  5. Step 5: Solve for x
    x = 329,139,838.30/20,862.78
  6. Step 6: Final answer
    x = 15,776.41

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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.