Home / 20,821.83-28,734.12-11,390.40

Finding the Fourth Proportional to 20,821.83, 28,734.12 and 11,390.40

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Solution

The fourth proportional to 20,821.83, 28,734.12 and 11,390.40 is: 15,718.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.83 : 28,734.12 = 11,390.40 : x
  2. Step 2: Convert to fraction form
    20,821.83/28,734.12 = 11,390.40/x
  3. Step 3: Cross multiply
    20,821.83x = 28,734.12 × 11,390.40
  4. Step 4: Simplify right side
    20,821.83x = 327,293,120.45
  5. Step 5: Solve for x
    x = 327,293,120.45/20,821.83
  6. Step 6: Final answer
    x = 15,718.75

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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.