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Finding the Fourth Proportional to 994.62, 1,372.62 and 663.18

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Solution

The fourth proportional to 994.62, 1,372.62 and 663.18 is: 915.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.62 : 1,372.62 = 663.18 : x
  2. Step 2: Convert to fraction form
    994.62/1,372.62 = 663.18/x
  3. Step 3: Cross multiply
    994.62x = 1,372.62 × 663.18
  4. Step 4: Simplify right side
    994.62x = 910,294.13
  5. Step 5: Solve for x
    x = 910,294.13/994.62
  6. Step 6: Final answer
    x = 915.22

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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.