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Finding the Fourth Proportional to 13,219.78, 18,243.44 and 7,251.30

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Solution

The fourth proportional to 13,219.78, 18,243.44 and 7,251.30 is: 10,006.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,219.78 : 18,243.44 = 7,251.30 : x
  2. Step 2: Convert to fraction form
    13,219.78/18,243.44 = 7,251.30/x
  3. Step 3: Cross multiply
    13,219.78x = 18,243.44 × 7,251.30
  4. Step 4: Simplify right side
    13,219.78x = 132,288,656.47
  5. Step 5: Solve for x
    x = 132,288,656.47/13,219.78
  6. Step 6: Final answer
    x = 10,006.87

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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.