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Finding the Fourth Proportional to 639.64, 954.79 and 548.92

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Solution

The fourth proportional to 639.64, 954.79 and 548.92 is: 819.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.64 : 954.79 = 548.92 : x
  2. Step 2: Convert to fraction form
    639.64/954.79 = 548.92/x
  3. Step 3: Cross multiply
    639.64x = 954.79 × 548.92
  4. Step 4: Simplify right side
    639.64x = 524,103.33
  5. Step 5: Solve for x
    x = 524,103.33/639.64
  6. Step 6: Final answer
    x = 819.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.