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Finding the Fourth Proportional to 15,121.69, 20,869.35 and 8,408.71

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Solution

The fourth proportional to 15,121.69, 20,869.35 and 8,408.71 is: 11,604.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.69 : 20,869.35 = 8,408.71 : x
  2. Step 2: Convert to fraction form
    15,121.69/20,869.35 = 8,408.71/x
  3. Step 3: Cross multiply
    15,121.69x = 20,869.35 × 8,408.71
  4. Step 4: Simplify right side
    15,121.69x = 175,484,306.59
  5. Step 5: Solve for x
    x = 175,484,306.59/15,121.69
  6. Step 6: Final answer
    x = 11,604.81

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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.