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Finding the Fourth Proportional to 643.20, 962.34 and 354.84

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Solution

The fourth proportional to 643.20, 962.34 and 354.84 is: 530.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.20 : 962.34 = 354.84 : x
  2. Step 2: Convert to fraction form
    643.20/962.34 = 354.84/x
  3. Step 3: Cross multiply
    643.20x = 962.34 × 354.84
  4. Step 4: Simplify right side
    643.20x = 341,476.73
  5. Step 5: Solve for x
    x = 341,476.73/643.20
  6. Step 6: Final answer
    x = 530.90

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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.