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Finding the Fourth Proportional to 639.44, 954.49 and 548.72

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Solution

The fourth proportional to 639.44, 954.49 and 548.72 is: 819.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.44 : 954.49 = 548.72 : x
  2. Step 2: Convert to fraction form
    639.44/954.49 = 548.72/x
  3. Step 3: Cross multiply
    639.44x = 954.49 × 548.72
  4. Step 4: Simplify right side
    639.44x = 523,742.12
  5. Step 5: Solve for x
    x = 523,742.12/639.44
  6. Step 6: Final answer
    x = 819.07

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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.