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Finding the Fourth Proportional to 639.21, 958.62 and 249.06

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Solution

The fourth proportional to 639.21, 958.62 and 249.06 is: 373.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.21 : 958.62 = 249.06 : x
  2. Step 2: Convert to fraction form
    639.21/958.62 = 249.06/x
  3. Step 3: Cross multiply
    639.21x = 958.62 × 249.06
  4. Step 4: Simplify right side
    639.21x = 238,753.90
  5. Step 5: Solve for x
    x = 238,753.90/639.21
  6. Step 6: Final answer
    x = 373.51

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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.