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Finding the Fourth Proportional to 994.08, 1,371.24 and 639.84

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Solution

The fourth proportional to 994.08, 1,371.24 and 639.84 is: 882.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.08 : 1,371.24 = 639.84 : x
  2. Step 2: Convert to fraction form
    994.08/1,371.24 = 639.84/x
  3. Step 3: Cross multiply
    994.08x = 1,371.24 × 639.84
  4. Step 4: Simplify right side
    994.08x = 877,374.20
  5. Step 5: Solve for x
    x = 877,374.20/994.08
  6. Step 6: Final answer
    x = 882.60

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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.