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Finding the Fourth Proportional to 827.82, 1,240.67 and 437.81

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Solution

The fourth proportional to 827.82, 1,240.67 and 437.81 is: 656.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.82 : 1,240.67 = 437.81 : x
  2. Step 2: Convert to fraction form
    827.82/1,240.67 = 437.81/x
  3. Step 3: Cross multiply
    827.82x = 1,240.67 × 437.81
  4. Step 4: Simplify right side
    827.82x = 543,169.34
  5. Step 5: Solve for x
    x = 543,169.34/827.82
  6. Step 6: Final answer
    x = 656.14

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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.