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Finding the Fourth Proportional to 12,489.78, 18,732.13 and 4,589.58

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Solution

The fourth proportional to 12,489.78, 18,732.13 and 4,589.58 is: 6,883.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.78 : 18,732.13 = 4,589.58 : x
  2. Step 2: Convert to fraction form
    12,489.78/18,732.13 = 4,589.58/x
  3. Step 3: Cross multiply
    12,489.78x = 18,732.13 × 4,589.58
  4. Step 4: Simplify right side
    12,489.78x = 85,972,586.26
  5. Step 5: Solve for x
    x = 85,972,586.26/12,489.78
  6. Step 6: Final answer
    x = 6,883.43

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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.