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Finding the Fourth Proportional to 643.55, 965.12 and 232.61

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Solution

The fourth proportional to 643.55, 965.12 and 232.61 is: 348.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.55 : 965.12 = 232.61 : x
  2. Step 2: Convert to fraction form
    643.55/965.12 = 232.61/x
  3. Step 3: Cross multiply
    643.55x = 965.12 × 232.61
  4. Step 4: Simplify right side
    643.55x = 224,490.57
  5. Step 5: Solve for x
    x = 224,490.57/643.55
  6. Step 6: Final answer
    x = 348.83

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Double scale
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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.