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Finding the Fourth Proportional to 691.17, 1,035.45 and 321.28

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Solution

The fourth proportional to 691.17, 1,035.45 and 321.28 is: 481.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.17 : 1,035.45 = 321.28 : x
  2. Step 2: Convert to fraction form
    691.17/1,035.45 = 321.28/x
  3. Step 3: Cross multiply
    691.17x = 1,035.45 × 321.28
  4. Step 4: Simplify right side
    691.17x = 332,669.38
  5. Step 5: Solve for x
    x = 332,669.38/691.17
  6. Step 6: Final answer
    x = 481.31

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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.