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Finding the Fourth Proportional to 13,438.78, 18,553.82 and 8,660.41

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Solution

The fourth proportional to 13,438.78, 18,553.82 and 8,660.41 is: 11,956.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,438.78 : 18,553.82 = 8,660.41 : x
  2. Step 2: Convert to fraction form
    13,438.78/18,553.82 = 8,660.41/x
  3. Step 3: Cross multiply
    13,438.78x = 18,553.82 × 8,660.41
  4. Step 4: Simplify right side
    13,438.78x = 160,683,688.27
  5. Step 5: Solve for x
    x = 160,683,688.27/13,438.78
  6. Step 6: Final answer
    x = 11,956.72

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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.