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Finding the Fourth Proportional to 1,108.30, 1,661.96 and 338.62

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Solution

The fourth proportional to 1,108.30, 1,661.96 and 338.62 is: 507.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.30 : 1,661.96 = 338.62 : x
  2. Step 2: Convert to fraction form
    1,108.30/1,661.96 = 338.62/x
  3. Step 3: Cross multiply
    1,108.30x = 1,661.96 × 338.62
  4. Step 4: Simplify right side
    1,108.30x = 562,772.90
  5. Step 5: Solve for x
    x = 562,772.90/1,108.30
  6. Step 6: Final answer
    x = 507.78

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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.