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Finding the Fourth Proportional to 1,108.25, 1,662.40 and 338.75

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Solution

The fourth proportional to 1,108.25, 1,662.40 and 338.75 is: 508.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.25 : 1,662.40 = 338.75 : x
  2. Step 2: Convert to fraction form
    1,108.25/1,662.40 = 338.75/x
  3. Step 3: Cross multiply
    1,108.25x = 1,662.40 × 338.75
  4. Step 4: Simplify right side
    1,108.25x = 563,137.15
  5. Step 5: Solve for x
    x = 563,137.15/1,108.25
  6. Step 6: Final answer
    x = 508.13

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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.