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Finding the Fourth Proportional to 748.15, 1,121.74 and 337.21

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Solution

The fourth proportional to 748.15, 1,121.74 and 337.21 is: 505.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.15 : 1,121.74 = 337.21 : x
  2. Step 2: Convert to fraction form
    748.15/1,121.74 = 337.21/x
  3. Step 3: Cross multiply
    748.15x = 1,121.74 × 337.21
  4. Step 4: Simplify right side
    748.15x = 378,261.95
  5. Step 5: Solve for x
    x = 378,261.95/748.15
  6. Step 6: Final answer
    x = 505.60

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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.