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Finding the Fourth Proportional to 748.74, 1,121.45 and 337.31

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Solution

The fourth proportional to 748.74, 1,121.45 and 337.31 is: 505.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.74 : 1,121.45 = 337.31 : x
  2. Step 2: Convert to fraction form
    748.74/1,121.45 = 337.31/x
  3. Step 3: Cross multiply
    748.74x = 1,121.45 × 337.31
  4. Step 4: Simplify right side
    748.74x = 378,279.52
  5. Step 5: Solve for x
    x = 378,279.52/748.74
  6. Step 6: Final answer
    x = 505.22

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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.