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Finding the Fourth Proportional to 639.68, 959.64 and 229.06

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Solution

The fourth proportional to 639.68, 959.64 and 229.06 is: 343.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.68 : 959.64 = 229.06 : x
  2. Step 2: Convert to fraction form
    639.68/959.64 = 229.06/x
  3. Step 3: Cross multiply
    639.68x = 959.64 × 229.06
  4. Step 4: Simplify right side
    639.68x = 219,809.19
  5. Step 5: Solve for x
    x = 219,809.19/639.68
  6. Step 6: Final answer
    x = 343.62

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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.