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Finding the Fourth Proportional to 827.10, 1,239.91 and 306.99

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Solution

The fourth proportional to 827.10, 1,239.91 and 306.99 is: 460.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.10 : 1,239.91 = 306.99 : x
  2. Step 2: Convert to fraction form
    827.10/1,239.91 = 306.99/x
  3. Step 3: Cross multiply
    827.10x = 1,239.91 × 306.99
  4. Step 4: Simplify right side
    827.10x = 380,639.97
  5. Step 5: Solve for x
    x = 380,639.97/827.10
  6. Step 6: Final answer
    x = 460.21

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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.