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Finding the Fourth Proportional to 691.92, 1,037.94 and 326.76

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Solution

The fourth proportional to 691.92, 1,037.94 and 326.76 is: 490.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.92 : 1,037.94 = 326.76 : x
  2. Step 2: Convert to fraction form
    691.92/1,037.94 = 326.76/x
  3. Step 3: Cross multiply
    691.92x = 1,037.94 × 326.76
  4. Step 4: Simplify right side
    691.92x = 339,157.27
  5. Step 5: Solve for x
    x = 339,157.27/691.92
  6. Step 6: Final answer
    x = 490.17

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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.