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Finding the Fourth Proportional to 691.73, 1,037.60 and 399.68

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Solution

The fourth proportional to 691.73, 1,037.60 and 399.68 is: 599.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.73 : 1,037.60 = 399.68 : x
  2. Step 2: Convert to fraction form
    691.73/1,037.60 = 399.68/x
  3. Step 3: Cross multiply
    691.73x = 1,037.60 × 399.68
  4. Step 4: Simplify right side
    691.73x = 414,700.78
  5. Step 5: Solve for x
    x = 414,700.78/691.73
  6. Step 6: Final answer
    x = 599.51

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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.