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Finding the Fourth Proportional to 15,122.68, 20,868.66 and 8,408.79

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Solution

The fourth proportional to 15,122.68, 20,868.66 and 8,408.79 is: 11,603.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,122.68 : 20,868.66 = 8,408.79 : x
  2. Step 2: Convert to fraction form
    15,122.68/20,868.66 = 8,408.79/x
  3. Step 3: Cross multiply
    15,122.68x = 20,868.66 × 8,408.79
  4. Step 4: Simplify right side
    15,122.68x = 175,480,179.52
  5. Step 5: Solve for x
    x = 175,480,179.52/15,122.68
  6. Step 6: Final answer
    x = 11,603.78

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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.