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Finding the Fourth Proportional to 738.20, 1,108.20 and 372.80

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Solution

The fourth proportional to 738.20, 1,108.20 and 372.80 is: 559.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.20 : 1,108.20 = 372.80 : x
  2. Step 2: Convert to fraction form
    738.20/1,108.20 = 372.80/x
  3. Step 3: Cross multiply
    738.20x = 1,108.20 × 372.80
  4. Step 4: Simplify right side
    738.20x = 413,136.96
  5. Step 5: Solve for x
    x = 413,136.96/738.20
  6. Step 6: Final answer
    x = 559.65

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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.