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Finding the Fourth Proportional to 639.76, 958.68 and 382.48

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Solution

The fourth proportional to 639.76, 958.68 and 382.48 is: 573.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.76 : 958.68 = 382.48 : x
  2. Step 2: Convert to fraction form
    639.76/958.68 = 382.48/x
  3. Step 3: Cross multiply
    639.76x = 958.68 × 382.48
  4. Step 4: Simplify right side
    639.76x = 366,675.93
  5. Step 5: Solve for x
    x = 366,675.93/639.76
  6. Step 6: Final answer
    x = 573.15

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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.