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Finding the Fourth Proportional to 994.56, 1,489.95 and 821.22

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Solution

The fourth proportional to 994.56, 1,489.95 and 821.22 is: 1,230.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.56 : 1,489.95 = 821.22 : x
  2. Step 2: Convert to fraction form
    994.56/1,489.95 = 821.22/x
  3. Step 3: Cross multiply
    994.56x = 1,489.95 × 821.22
  4. Step 4: Simplify right side
    994.56x = 1,223,576.74
  5. Step 5: Solve for x
    x = 1,223,576.74/994.56
  6. Step 6: Final answer
    x = 1,230.27

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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.