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Finding the Fourth Proportional to 15,121.26, 20,866.05 and 8,404.74

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Solution

The fourth proportional to 15,121.26, 20,866.05 and 8,404.74 is: 11,597.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.26 : 20,866.05 = 8,404.74 : x
  2. Step 2: Convert to fraction form
    15,121.26/20,866.05 = 8,404.74/x
  3. Step 3: Cross multiply
    15,121.26x = 20,866.05 × 8,404.74
  4. Step 4: Simplify right side
    15,121.26x = 175,373,725.08
  5. Step 5: Solve for x
    x = 175,373,725.08/15,121.26
  6. Step 6: Final answer
    x = 11,597.82

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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.