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Finding the Fourth Proportional to 15,121.08, 20,868.03 and 8,408.21

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Solution

The fourth proportional to 15,121.08, 20,868.03 and 8,408.21 is: 11,603.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,121.08 : 20,868.03 = 8,408.21 : x
  2. Step 2: Convert to fraction form
    15,121.08/20,868.03 = 8,408.21/x
  3. Step 3: Cross multiply
    15,121.08x = 20,868.03 × 8,408.21
  4. Step 4: Simplify right side
    15,121.08x = 175,462,674.19
  5. Step 5: Solve for x
    x = 175,462,674.19/15,121.08
  6. Step 6: Final answer
    x = 11,603.85

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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.