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Finding the Fourth Proportional to 691.59, 1,037.61 and 326.42

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Solution

The fourth proportional to 691.59, 1,037.61 and 326.42 is: 489.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.59 : 1,037.61 = 326.42 : x
  2. Step 2: Convert to fraction form
    691.59/1,037.61 = 326.42/x
  3. Step 3: Cross multiply
    691.59x = 1,037.61 × 326.42
  4. Step 4: Simplify right side
    691.59x = 338,696.66
  5. Step 5: Solve for x
    x = 338,696.66/691.59
  6. Step 6: Final answer
    x = 489.74

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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.