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Finding the Fourth Proportional to 15,123.11, 20,869.78 and 8,408.68

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Solution

The fourth proportional to 15,123.11, 20,869.78 and 8,408.68 is: 11,603.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,123.11 : 20,869.78 = 8,408.68 : x
  2. Step 2: Convert to fraction form
    15,123.11/20,869.78 = 8,408.68/x
  3. Step 3: Cross multiply
    15,123.11x = 20,869.78 × 8,408.68
  4. Step 4: Simplify right side
    15,123.11x = 175,487,344.13
  5. Step 5: Solve for x
    x = 175,487,344.13/15,123.11
  6. Step 6: Final answer
    x = 11,603.92

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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.