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Finding the Fourth Proportional to 640.04, 959.86 and 206.96

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Solution

The fourth proportional to 640.04, 959.86 and 206.96 is: 310.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.04 : 959.86 = 206.96 : x
  2. Step 2: Convert to fraction form
    640.04/959.86 = 206.96/x
  3. Step 3: Cross multiply
    640.04x = 959.86 × 206.96
  4. Step 4: Simplify right side
    640.04x = 198,652.63
  5. Step 5: Solve for x
    x = 198,652.63/640.04
  6. Step 6: Final answer
    x = 310.38

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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.