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Finding the Fourth Proportional to 640.41, 960.80 and 207.60

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Solution

The fourth proportional to 640.41, 960.80 and 207.60 is: 311.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.41 : 960.80 = 207.60 : x
  2. Step 2: Convert to fraction form
    640.41/960.80 = 207.60/x
  3. Step 3: Cross multiply
    640.41x = 960.80 × 207.60
  4. Step 4: Simplify right side
    640.41x = 199,462.08
  5. Step 5: Solve for x
    x = 199,462.08/640.41
  6. Step 6: Final answer
    x = 311.46

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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.