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Finding the Fourth Proportional to 732.78, 1,098.90 and 321.84

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Solution

The fourth proportional to 732.78, 1,098.90 and 321.84 is: 482.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    732.78 : 1,098.90 = 321.84 : x
  2. Step 2: Convert to fraction form
    732.78/1,098.90 = 321.84/x
  3. Step 3: Cross multiply
    732.78x = 1,098.90 × 321.84
  4. Step 4: Simplify right side
    732.78x = 353,669.98
  5. Step 5: Solve for x
    x = 353,669.98/732.78
  6. Step 6: Final answer
    x = 482.64

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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.