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Finding the Fourth Proportional to 18,778.62, 25,913.76 and 11,229.12

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Solution

The fourth proportional to 18,778.62, 25,913.76 and 11,229.12 is: 15,495.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,778.62 : 25,913.76 = 11,229.12 : x
  2. Step 2: Convert to fraction form
    18,778.62/25,913.76 = 11,229.12/x
  3. Step 3: Cross multiply
    18,778.62x = 25,913.76 × 11,229.12
  4. Step 4: Simplify right side
    18,778.62x = 290,988,720.69
  5. Step 5: Solve for x
    x = 290,988,720.69/18,778.62
  6. Step 6: Final answer
    x = 15,495.75

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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.