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Finding the Fourth Proportional to 691.29, 1,036.85 and 204.39

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Solution

The fourth proportional to 691.29, 1,036.85 and 204.39 is: 306.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.29 : 1,036.85 = 204.39 : x
  2. Step 2: Convert to fraction form
    691.29/1,036.85 = 204.39/x
  3. Step 3: Cross multiply
    691.29x = 1,036.85 × 204.39
  4. Step 4: Simplify right side
    691.29x = 211,920.75
  5. Step 5: Solve for x
    x = 211,920.75/691.29
  6. Step 6: Final answer
    x = 306.56

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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.