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Finding the Fourth Proportional to 1,108.75, 1,663.41 and 339.25

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Solution

The fourth proportional to 1,108.75, 1,663.41 and 339.25 is: 508.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.75 : 1,663.41 = 339.25 : x
  2. Step 2: Convert to fraction form
    1,108.75/1,663.41 = 339.25/x
  3. Step 3: Cross multiply
    1,108.75x = 1,663.41 × 339.25
  4. Step 4: Simplify right side
    1,108.75x = 564,311.84
  5. Step 5: Solve for x
    x = 564,311.84/1,108.75
  6. Step 6: Final answer
    x = 508.96

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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.