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Finding the Fourth Proportional to 827.11, 1,239.81 and 306.64

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Solution

The fourth proportional to 827.11, 1,239.81 and 306.64 is: 459.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.11 : 1,239.81 = 306.64 : x
  2. Step 2: Convert to fraction form
    827.11/1,239.81 = 306.64/x
  3. Step 3: Cross multiply
    827.11x = 1,239.81 × 306.64
  4. Step 4: Simplify right side
    827.11x = 380,175.34
  5. Step 5: Solve for x
    x = 380,175.34/827.11
  6. Step 6: Final answer
    x = 459.64

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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.