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Finding the Fourth Proportional to 15,115.78, 20,860.48 and 8,401.52

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Solution

The fourth proportional to 15,115.78, 20,860.48 and 8,401.52 is: 11,594.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,115.78 : 20,860.48 = 8,401.52 : x
  2. Step 2: Convert to fraction form
    15,115.78/20,860.48 = 8,401.52/x
  3. Step 3: Cross multiply
    15,115.78x = 20,860.48 × 8,401.52
  4. Step 4: Simplify right side
    15,115.78x = 175,259,614.62
  5. Step 5: Solve for x
    x = 175,259,614.62/15,115.78
  6. Step 6: Final answer
    x = 11,594.48

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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.