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Finding the Fourth Proportional to 15,069.78, 20,797.76 and 8,781.75

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Solution

The fourth proportional to 15,069.78, 20,797.76 and 8,781.75 is: 12,119.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,069.78 : 20,797.76 = 8,781.75 : x
  2. Step 2: Convert to fraction form
    15,069.78/20,797.76 = 8,781.75/x
  3. Step 3: Cross multiply
    15,069.78x = 20,797.76 × 8,781.75
  4. Step 4: Simplify right side
    15,069.78x = 182,640,750.83
  5. Step 5: Solve for x
    x = 182,640,750.83/15,069.78
  6. Step 6: Final answer
    x = 12,119.67

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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.