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Finding the Fourth Proportional to 640.04, 959.85 and 207.09

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Solution

The fourth proportional to 640.04, 959.85 and 207.09 is: 310.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.04 : 959.85 = 207.09 : x
  2. Step 2: Convert to fraction form
    640.04/959.85 = 207.09/x
  3. Step 3: Cross multiply
    640.04x = 959.85 × 207.09
  4. Step 4: Simplify right side
    640.04x = 198,775.34
  5. Step 5: Solve for x
    x = 198,775.34/640.04
  6. Step 6: Final answer
    x = 310.57

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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.