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Finding the Fourth Proportional to 691.21, 1,036.87 and 252.58

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Solution

The fourth proportional to 691.21, 1,036.87 and 252.58 is: 378.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.21 : 1,036.87 = 252.58 : x
  2. Step 2: Convert to fraction form
    691.21/1,036.87 = 252.58/x
  3. Step 3: Cross multiply
    691.21x = 1,036.87 × 252.58
  4. Step 4: Simplify right side
    691.21x = 261,892.62
  5. Step 5: Solve for x
    x = 261,892.62/691.21
  6. Step 6: Final answer
    x = 378.89

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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.