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Finding the Fourth Proportional to 640.18, 960.16 and 207.28

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Solution

The fourth proportional to 640.18, 960.16 and 207.28 is: 310.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.18 : 960.16 = 207.28 : x
  2. Step 2: Convert to fraction form
    640.18/960.16 = 207.28/x
  3. Step 3: Cross multiply
    640.18x = 960.16 × 207.28
  4. Step 4: Simplify right side
    640.18x = 199,021.96
  5. Step 5: Solve for x
    x = 199,021.96/640.18
  6. Step 6: Final answer
    x = 310.88

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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.