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Finding the Fourth Proportional to 12,687.66, 19,031.49 and 3,922.38

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Solution

The fourth proportional to 12,687.66, 19,031.49 and 3,922.38 is: 5,883.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,687.66 : 19,031.49 = 3,922.38 : x
  2. Step 2: Convert to fraction form
    12,687.66/19,031.49 = 3,922.38/x
  3. Step 3: Cross multiply
    12,687.66x = 19,031.49 × 3,922.38
  4. Step 4: Simplify right side
    12,687.66x = 74,648,735.75
  5. Step 5: Solve for x
    x = 74,648,735.75/12,687.66
  6. Step 6: Final answer
    x = 5,883.57

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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.