Home / 20,821.78-28,734.27-11,390.14

Finding the Fourth Proportional to 20,821.78, 28,734.27 and 11,390.14

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Solution

The fourth proportional to 20,821.78, 28,734.27 and 11,390.14 is: 15,718.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.78 : 28,734.27 = 11,390.14 : x
  2. Step 2: Convert to fraction form
    20,821.78/28,734.27 = 11,390.14/x
  3. Step 3: Cross multiply
    20,821.78x = 28,734.27 × 11,390.14
  4. Step 4: Simplify right side
    20,821.78x = 327,287,358.10
  5. Step 5: Solve for x
    x = 327,287,358.10/20,821.78
  6. Step 6: Final answer
    x = 15,718.51

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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.