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Finding the Fourth Proportional to 989.02, 1,364.97 and 639.46

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Solution

The fourth proportional to 989.02, 1,364.97 and 639.46 is: 882.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.02 : 1,364.97 = 639.46 : x
  2. Step 2: Convert to fraction form
    989.02/1,364.97 = 639.46/x
  3. Step 3: Cross multiply
    989.02x = 1,364.97 × 639.46
  4. Step 4: Simplify right side
    989.02x = 872,843.72
  5. Step 5: Solve for x
    x = 872,843.72/989.02
  6. Step 6: Final answer
    x = 882.53

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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.