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Finding the Fourth Proportional to 731.78, 1,098.27 and 321.21

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Solution

The fourth proportional to 731.78, 1,098.27 and 321.21 is: 482.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.78 : 1,098.27 = 321.21 : x
  2. Step 2: Convert to fraction form
    731.78/1,098.27 = 321.21/x
  3. Step 3: Cross multiply
    731.78x = 1,098.27 × 321.21
  4. Step 4: Simplify right side
    731.78x = 352,775.31
  5. Step 5: Solve for x
    x = 352,775.31/731.78
  6. Step 6: Final answer
    x = 482.08

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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.