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Finding the Fourth Proportional to 15,211.75, 20,992.22 and 8,587.75

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Solution

The fourth proportional to 15,211.75, 20,992.22 and 8,587.75 is: 11,851.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,211.75 : 20,992.22 = 8,587.75 : x
  2. Step 2: Convert to fraction form
    15,211.75/20,992.22 = 8,587.75/x
  3. Step 3: Cross multiply
    15,211.75x = 20,992.22 × 8,587.75
  4. Step 4: Simplify right side
    15,211.75x = 180,275,894.37
  5. Step 5: Solve for x
    x = 180,275,894.37/15,211.75
  6. Step 6: Final answer
    x = 11,851.10

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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.