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Finding the Fourth Proportional to 15,213.78, 20,992.77 and 8,928.18

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Solution

The fourth proportional to 15,213.78, 20,992.77 and 8,928.18 is: 12,319.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,213.78 : 20,992.77 = 8,928.18 : x
  2. Step 2: Convert to fraction form
    15,213.78/20,992.77 = 8,928.18/x
  3. Step 3: Cross multiply
    15,213.78x = 20,992.77 × 8,928.18
  4. Step 4: Simplify right side
    15,213.78x = 187,427,229.26
  5. Step 5: Solve for x
    x = 187,427,229.26/15,213.78
  6. Step 6: Final answer
    x = 12,319.57

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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.