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Finding the Fourth Proportional to 639.23, 959.00 and 222.70

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Solution

The fourth proportional to 639.23, 959.00 and 222.70 is: 334.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.23 : 959.00 = 222.70 : x
  2. Step 2: Convert to fraction form
    639.23/959.00 = 222.70/x
  3. Step 3: Cross multiply
    639.23x = 959.00 × 222.70
  4. Step 4: Simplify right side
    639.23x = 213,568.84
  5. Step 5: Solve for x
    x = 213,568.84/639.23
  6. Step 6: Final answer
    x = 334.10

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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.