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Finding the Fourth Proportional to 639.17, 954.09 and 548.45

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Solution

The fourth proportional to 639.17, 954.09 and 548.45 is: 818.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.17 : 954.09 = 548.45 : x
  2. Step 2: Convert to fraction form
    639.17/954.09 = 548.45/x
  3. Step 3: Cross multiply
    639.17x = 954.09 × 548.45
  4. Step 4: Simplify right side
    639.17x = 523,273.05
  5. Step 5: Solve for x
    x = 523,273.05/639.17
  6. Step 6: Final answer
    x = 818.67

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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.