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Finding the Fourth Proportional to 643.18, 964.62 and 226.66

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Solution

The fourth proportional to 643.18, 964.62 and 226.66 is: 339.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.18 : 964.62 = 226.66 : x
  2. Step 2: Convert to fraction form
    643.18/964.62 = 226.66/x
  3. Step 3: Cross multiply
    643.18x = 964.62 × 226.66
  4. Step 4: Simplify right side
    643.18x = 218,640.77
  5. Step 5: Solve for x
    x = 218,640.77/643.18
  6. Step 6: Final answer
    x = 339.94

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Double scale
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Similar ratio
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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.