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Finding the Fourth Proportional to 994.30, 1,491.96 and 665.48

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Solution

The fourth proportional to 994.30, 1,491.96 and 665.48 is: 998.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.30 : 1,491.96 = 665.48 : x
  2. Step 2: Convert to fraction form
    994.30/1,491.96 = 665.48/x
  3. Step 3: Cross multiply
    994.30x = 1,491.96 × 665.48
  4. Step 4: Simplify right side
    994.30x = 992,869.54
  5. Step 5: Solve for x
    x = 992,869.54/994.30
  6. Step 6: Final answer
    x = 998.56

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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.