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Finding the Fourth Proportional to 639.25, 957.35 and 395.03

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Solution

The fourth proportional to 639.25, 957.35 and 395.03 is: 591.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.25 : 957.35 = 395.03 : x
  2. Step 2: Convert to fraction form
    639.25/957.35 = 395.03/x
  3. Step 3: Cross multiply
    639.25x = 957.35 × 395.03
  4. Step 4: Simplify right side
    639.25x = 378,180.00
  5. Step 5: Solve for x
    x = 378,180.00/639.25
  6. Step 6: Final answer
    x = 591.60

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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.