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Finding the Fourth Proportional to 1,108.52, 1,662.36 and 378.20

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Solution

The fourth proportional to 1,108.52, 1,662.36 and 378.20 is: 567.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.52 : 1,662.36 = 378.20 : x
  2. Step 2: Convert to fraction form
    1,108.52/1,662.36 = 378.20/x
  3. Step 3: Cross multiply
    1,108.52x = 1,662.36 × 378.20
  4. Step 4: Simplify right side
    1,108.52x = 628,704.55
  5. Step 5: Solve for x
    x = 628,704.55/1,108.52
  6. Step 6: Final answer
    x = 567.16

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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.