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Finding the Fourth Proportional to 732.78, 1,011.33 and 438.21

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Solution

The fourth proportional to 732.78, 1,011.33 and 438.21 is: 604.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    732.78 : 1,011.33 = 438.21 : x
  2. Step 2: Convert to fraction form
    732.78/1,011.33 = 438.21/x
  3. Step 3: Cross multiply
    732.78x = 1,011.33 × 438.21
  4. Step 4: Simplify right side
    732.78x = 443,174.92
  5. Step 5: Solve for x
    x = 443,174.92/732.78
  6. Step 6: Final answer
    x = 604.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.