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Finding the Fourth Proportional to 639, 958.50 and 254.25

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Solution

The fourth proportional to 639, 958.50 and 254.25 is: 381.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    639 : 958.50 = 254.25 : x
  2. Step 2: Convert to fraction form
    639/958.50 = 254.25/x
  3. Step 3: Cross multiply
    639x = 958.50 × 254.25
  4. Step 4: Simplify right side
    639x = 243,698.63
  5. Step 5: Solve for x
    x = 243,698.63/639
  6. Step 6: Final answer
    x = 381.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.