Home / 20,821.64-28,733.72-11,390.22

Finding the Fourth Proportional to 20,821.64, 28,733.72 and 11,390.22

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Solution

The fourth proportional to 20,821.64, 28,733.72 and 11,390.22 is: 15,718.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.64 : 28,733.72 = 11,390.22 : x
  2. Step 2: Convert to fraction form
    20,821.64/28,733.72 = 11,390.22/x
  3. Step 3: Cross multiply
    20,821.64x = 28,733.72 × 11,390.22
  4. Step 4: Simplify right side
    20,821.64x = 327,283,335.27
  5. Step 5: Solve for x
    x = 327,283,335.27/20,821.64
  6. Step 6: Final answer
    x = 15,718.43

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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.