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Finding the Fourth Proportional to 1,108.76, 1,663.49 and 378.34

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Solution

The fourth proportional to 1,108.76, 1,663.49 and 378.34 is: 567.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.76 : 1,663.49 = 378.34 : x
  2. Step 2: Convert to fraction form
    1,108.76/1,663.49 = 378.34/x
  3. Step 3: Cross multiply
    1,108.76x = 1,663.49 × 378.34
  4. Step 4: Simplify right side
    1,108.76x = 629,362.97
  5. Step 5: Solve for x
    x = 629,362.97/1,108.76
  6. Step 6: Final answer
    x = 567.63

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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.