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Finding the Fourth Proportional to 639.45, 959.22 and 177.30

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Solution

The fourth proportional to 639.45, 959.22 and 177.30 is: 265.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.45 : 959.22 = 177.30 : x
  2. Step 2: Convert to fraction form
    639.45/959.22 = 177.30/x
  3. Step 3: Cross multiply
    639.45x = 959.22 × 177.30
  4. Step 4: Simplify right side
    639.45x = 170,069.71
  5. Step 5: Solve for x
    x = 170,069.71/639.45
  6. Step 6: Final answer
    x = 265.96

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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.