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Finding the Fourth Proportional to 15,119.78, 20,863.70 and 8,404.31

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Solution

The fourth proportional to 15,119.78, 20,863.70 and 8,404.31 is: 11,597.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,119.78 : 20,863.70 = 8,404.31 : x
  2. Step 2: Convert to fraction form
    15,119.78/20,863.70 = 8,404.31/x
  3. Step 3: Cross multiply
    15,119.78x = 20,863.70 × 8,404.31
  4. Step 4: Simplify right side
    15,119.78x = 175,345,012.68
  5. Step 5: Solve for x
    x = 175,345,012.68/15,119.78
  6. Step 6: Final answer
    x = 11,597.06

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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.