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Finding the Fourth Proportional to 827.98, 1,240.35 and 661.42

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Solution

The fourth proportional to 827.98, 1,240.35 and 661.42 is: 990.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.98 : 1,240.35 = 661.42 : x
  2. Step 2: Convert to fraction form
    827.98/1,240.35 = 661.42/x
  3. Step 3: Cross multiply
    827.98x = 1,240.35 × 661.42
  4. Step 4: Simplify right side
    827.98x = 820,391.37
  5. Step 5: Solve for x
    x = 820,391.37/827.98
  6. Step 6: Final answer
    x = 990.84

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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.