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Finding the Fourth Proportional to 643.20, 962.61 and 396.56

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Solution

The fourth proportional to 643.20, 962.61 and 396.56 is: 593.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.20 : 962.61 = 396.56 : x
  2. Step 2: Convert to fraction form
    643.20/962.61 = 396.56/x
  3. Step 3: Cross multiply
    643.20x = 962.61 × 396.56
  4. Step 4: Simplify right side
    643.20x = 381,732.62
  5. Step 5: Solve for x
    x = 381,732.62/643.20
  6. Step 6: Final answer
    x = 593.49

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.