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Finding the Fourth Proportional to 747.34, 1,121.31 and 336.20

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Solution

The fourth proportional to 747.34, 1,121.31 and 336.20 is: 504.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.34 : 1,121.31 = 336.20 : x
  2. Step 2: Convert to fraction form
    747.34/1,121.31 = 336.20/x
  3. Step 3: Cross multiply
    747.34x = 1,121.31 × 336.20
  4. Step 4: Simplify right side
    747.34x = 376,978.82
  5. Step 5: Solve for x
    x = 376,978.82/747.34
  6. Step 6: Final answer
    x = 504.43

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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.