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Finding the Fourth Proportional to 18,947.60, 26,143.44 and 11,391.44

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Solution

The fourth proportional to 18,947.60, 26,143.44 and 11,391.44 is: 15,717.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,947.60 : 26,143.44 = 11,391.44 : x
  2. Step 2: Convert to fraction form
    18,947.60/26,143.44 = 11,391.44/x
  3. Step 3: Cross multiply
    18,947.60x = 26,143.44 × 11,391.44
  4. Step 4: Simplify right side
    18,947.60x = 297,811,428.15
  5. Step 5: Solve for x
    x = 297,811,428.15/18,947.60
  6. Step 6: Final answer
    x = 15,717.63

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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.