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Finding the Fourth Proportional to 691.53, 1,037.48 and 399.21

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Solution

The fourth proportional to 691.53, 1,037.48 and 399.21 is: 598.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.53 : 1,037.48 = 399.21 : x
  2. Step 2: Convert to fraction form
    691.53/1,037.48 = 399.21/x
  3. Step 3: Cross multiply
    691.53x = 1,037.48 × 399.21
  4. Step 4: Simplify right side
    691.53x = 414,170.39
  5. Step 5: Solve for x
    x = 414,170.39/691.53
  6. Step 6: Final answer
    x = 598.92

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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.