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Finding the Fourth Proportional to 1,079.09, 1,618.68 and 338.75

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Solution

The fourth proportional to 1,079.09, 1,618.68 and 338.75 is: 508.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.09 : 1,618.68 = 338.75 : x
  2. Step 2: Convert to fraction form
    1,079.09/1,618.68 = 338.75/x
  3. Step 3: Cross multiply
    1,079.09x = 1,618.68 × 338.75
  4. Step 4: Simplify right side
    1,079.09x = 548,327.10
  5. Step 5: Solve for x
    x = 548,327.10/1,079.09
  6. Step 6: Final answer
    x = 508.14

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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.