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Finding the Fourth Proportional to 15,151.75, 20,911.04 and 8,869.39

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Solution

The fourth proportional to 15,151.75, 20,911.04 and 8,869.39 is: 12,240.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,151.75 : 20,911.04 = 8,869.39 : x
  2. Step 2: Convert to fraction form
    15,151.75/20,911.04 = 8,869.39/x
  3. Step 3: Cross multiply
    15,151.75x = 20,911.04 × 8,869.39
  4. Step 4: Simplify right side
    15,151.75x = 185,468,169.07
  5. Step 5: Solve for x
    x = 185,468,169.07/15,151.75
  6. Step 6: Final answer
    x = 12,240.71

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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.