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Finding the Fourth Proportional to 15,122.58, 20,868.78 and 8,408.14

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Solution

The fourth proportional to 15,122.58, 20,868.78 and 8,408.14 is: 11,603.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,122.58 : 20,868.78 = 8,408.14 : x
  2. Step 2: Convert to fraction form
    15,122.58/20,868.78 = 8,408.14/x
  3. Step 3: Cross multiply
    15,122.58x = 20,868.78 × 8,408.14
  4. Step 4: Simplify right side
    15,122.58x = 175,467,623.87
  5. Step 5: Solve for x
    x = 175,467,623.87/15,122.58
  6. Step 6: Final answer
    x = 11,603.02

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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.