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Finding the Fourth Proportional to 13,605.28, 18,775.32 and 7,943.92

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Solution

The fourth proportional to 13,605.28, 18,775.32 and 7,943.92 is: 10,962.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,605.28 : 18,775.32 = 7,943.92 : x
  2. Step 2: Convert to fraction form
    13,605.28/18,775.32 = 7,943.92/x
  3. Step 3: Cross multiply
    13,605.28x = 18,775.32 × 7,943.92
  4. Step 4: Simplify right side
    13,605.28x = 149,149,640.05
  5. Step 5: Solve for x
    x = 149,149,640.05/13,605.28
  6. Step 6: Final answer
    x = 10,962.63

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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.