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Finding the Fourth Proportional to 18,737.40, 25,847.82 and 12,687.78

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Solution

The fourth proportional to 18,737.40, 25,847.82 and 12,687.78 is: 17,502.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,737.40 : 25,847.82 = 12,687.78 : x
  2. Step 2: Convert to fraction form
    18,737.40/25,847.82 = 12,687.78/x
  3. Step 3: Cross multiply
    18,737.40x = 25,847.82 × 12,687.78
  4. Step 4: Simplify right side
    18,737.40x = 327,951,453.64
  5. Step 5: Solve for x
    x = 327,951,453.64/18,737.40
  6. Step 6: Final answer
    x = 17,502.51

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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.