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Finding the Fourth Proportional to 994.40, 1,371.48 and 639.92

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Solution

The fourth proportional to 994.40, 1,371.48 and 639.92 is: 882.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.40 : 1,371.48 = 639.92 : x
  2. Step 2: Convert to fraction form
    994.40/1,371.48 = 639.92/x
  3. Step 3: Cross multiply
    994.40x = 1,371.48 × 639.92
  4. Step 4: Simplify right side
    994.40x = 877,637.48
  5. Step 5: Solve for x
    x = 877,637.48/994.40
  6. Step 6: Final answer
    x = 882.58

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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.