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Finding the Fourth Proportional to 801.21, 1,105.29 and 521.69

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Solution

The fourth proportional to 801.21, 1,105.29 and 521.69 is: 719.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.21 : 1,105.29 = 521.69 : x
  2. Step 2: Convert to fraction form
    801.21/1,105.29 = 521.69/x
  3. Step 3: Cross multiply
    801.21x = 1,105.29 × 521.69
  4. Step 4: Simplify right side
    801.21x = 576,613.21
  5. Step 5: Solve for x
    x = 576,613.21/801.21
  6. Step 6: Final answer
    x = 719.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.