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Finding the Fourth Proportional to 18,418.61, 27,640.68 and 7,324.25

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Solution

The fourth proportional to 18,418.61, 27,640.68 and 7,324.25 is: 10,991.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,418.61 : 27,640.68 = 7,324.25 : x
  2. Step 2: Convert to fraction form
    18,418.61/27,640.68 = 7,324.25/x
  3. Step 3: Cross multiply
    18,418.61x = 27,640.68 × 7,324.25
  4. Step 4: Simplify right side
    18,418.61x = 202,447,250.49
  5. Step 5: Solve for x
    x = 202,447,250.49/18,418.61
  6. Step 6: Final answer
    x = 10,991.45

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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.