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Finding the Fourth Proportional to 691.97, 1,038.24 and 326.66

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Solution

The fourth proportional to 691.97, 1,038.24 and 326.66 is: 490.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.97 : 1,038.24 = 326.66 : x
  2. Step 2: Convert to fraction form
    691.97/1,038.24 = 326.66/x
  3. Step 3: Cross multiply
    691.97x = 1,038.24 × 326.66
  4. Step 4: Simplify right side
    691.97x = 339,146.29
  5. Step 5: Solve for x
    x = 339,146.29/691.97
  6. Step 6: Final answer
    x = 490.12

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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.