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Finding the Fourth Proportional to 994.10, 1,371.60 and 662.31

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Solution

The fourth proportional to 994.10, 1,371.60 and 662.31 is: 913.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.10 : 1,371.60 = 662.31 : x
  2. Step 2: Convert to fraction form
    994.10/1,371.60 = 662.31/x
  3. Step 3: Cross multiply
    994.10x = 1,371.60 × 662.31
  4. Step 4: Simplify right side
    994.10x = 908,424.40
  5. Step 5: Solve for x
    x = 908,424.40/994.10
  6. Step 6: Final answer
    x = 913.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.