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Finding the Fourth Proportional to 827.76, 1,239.72 and 664.08

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Solution

The fourth proportional to 827.76, 1,239.72 and 664.08 is: 994.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.76 : 1,239.72 = 664.08 : x
  2. Step 2: Convert to fraction form
    827.76/1,239.72 = 664.08/x
  3. Step 3: Cross multiply
    827.76x = 1,239.72 × 664.08
  4. Step 4: Simplify right side
    827.76x = 823,273.26
  5. Step 5: Solve for x
    x = 823,273.26/827.76
  6. Step 6: Final answer
    x = 994.58

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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.