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Finding the Fourth Proportional to 639.37, 957.43 and 395.15

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Solution

The fourth proportional to 639.37, 957.43 and 395.15 is: 591.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.37 : 957.43 = 395.15 : x
  2. Step 2: Convert to fraction form
    639.37/957.43 = 395.15/x
  3. Step 3: Cross multiply
    639.37x = 957.43 × 395.15
  4. Step 4: Simplify right side
    639.37x = 378,331.35
  5. Step 5: Solve for x
    x = 378,331.35/639.37
  6. Step 6: Final answer
    x = 591.73

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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.