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Finding the Fourth Proportional to 15,123.15, 20,869.47 and 8,408.91

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Solution

The fourth proportional to 15,123.15, 20,869.47 and 8,408.91 is: 11,604.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,123.15 : 20,869.47 = 8,408.91 : x
  2. Step 2: Convert to fraction form
    15,123.15/20,869.47 = 8,408.91/x
  3. Step 3: Cross multiply
    15,123.15x = 20,869.47 × 8,408.91
  4. Step 4: Simplify right side
    15,123.15x = 175,489,494.98
  5. Step 5: Solve for x
    x = 175,489,494.98/15,123.15
  6. Step 6: Final answer
    x = 11,604.03

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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.