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Finding the Fourth Proportional to 993.32, 1,371.38 and 639.44

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Solution

The fourth proportional to 993.32, 1,371.38 and 639.44 is: 882.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.32 : 1,371.38 = 639.44 : x
  2. Step 2: Convert to fraction form
    993.32/1,371.38 = 639.44/x
  3. Step 3: Cross multiply
    993.32x = 1,371.38 × 639.44
  4. Step 4: Simplify right side
    993.32x = 876,915.23
  5. Step 5: Solve for x
    x = 876,915.23/993.32
  6. Step 6: Final answer
    x = 882.81

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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.