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Finding the Fourth Proportional to 993.46, 1,371.62 and 639.54

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Solution

The fourth proportional to 993.46, 1,371.62 and 639.54 is: 882.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.46 : 1,371.62 = 639.54 : x
  2. Step 2: Convert to fraction form
    993.46/1,371.62 = 639.54/x
  3. Step 3: Cross multiply
    993.46x = 1,371.62 × 639.54
  4. Step 4: Simplify right side
    993.46x = 877,205.85
  5. Step 5: Solve for x
    x = 877,205.85/993.46
  6. Step 6: Final answer
    x = 882.98

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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.