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Finding the Fourth Proportional to 639.64, 958.74 and 254.52

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Solution

The fourth proportional to 639.64, 958.74 and 254.52 is: 381.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.64 : 958.74 = 254.52 : x
  2. Step 2: Convert to fraction form
    639.64/958.74 = 254.52/x
  3. Step 3: Cross multiply
    639.64x = 958.74 × 254.52
  4. Step 4: Simplify right side
    639.64x = 244,018.50
  5. Step 5: Solve for x
    x = 244,018.50/639.64
  6. Step 6: Final answer
    x = 381.49

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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.