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Finding the Fourth Proportional to 12,388.95, 18,568.85 and 6,147.09

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Solution

The fourth proportional to 12,388.95, 18,568.85 and 6,147.09 is: 9,213.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,388.95 : 18,568.85 = 6,147.09 : x
  2. Step 2: Convert to fraction form
    12,388.95/18,568.85 = 6,147.09/x
  3. Step 3: Cross multiply
    12,388.95x = 18,568.85 × 6,147.09
  4. Step 4: Simplify right side
    12,388.95x = 114,144,361.41
  5. Step 5: Solve for x
    x = 114,144,361.41/12,388.95
  6. Step 6: Final answer
    x = 9,213.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.