Home / 20,939.22-28,886.49-12,865.55

Finding the Fourth Proportional to 20,939.22, 28,886.49 and 12,865.55

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Solution

The fourth proportional to 20,939.22, 28,886.49 and 12,865.55 is: 17,748.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.22 : 28,886.49 = 12,865.55 : x
  2. Step 2: Convert to fraction form
    20,939.22/28,886.49 = 12,865.55/x
  3. Step 3: Cross multiply
    20,939.22x = 28,886.49 × 12,865.55
  4. Step 4: Simplify right side
    20,939.22x = 371,640,436.99
  5. Step 5: Solve for x
    x = 371,640,436.99/20,939.22
  6. Step 6: Final answer
    x = 17,748.53

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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.