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Finding the Fourth Proportional to 640.18, 960.30 and 229.51

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Solution

The fourth proportional to 640.18, 960.30 and 229.51 is: 344.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.18 : 960.30 = 229.51 : x
  2. Step 2: Convert to fraction form
    640.18/960.30 = 229.51/x
  3. Step 3: Cross multiply
    640.18x = 960.30 × 229.51
  4. Step 4: Simplify right side
    640.18x = 220,398.45
  5. Step 5: Solve for x
    x = 220,398.45/640.18
  6. Step 6: Final answer
    x = 344.28

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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.