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Finding the Fourth Proportional to 643.24, 965.40 and 354.88

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Solution

The fourth proportional to 643.24, 965.40 and 354.88 is: 532.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.24 : 965.40 = 354.88 : x
  2. Step 2: Convert to fraction form
    643.24/965.40 = 354.88/x
  3. Step 3: Cross multiply
    643.24x = 965.40 × 354.88
  4. Step 4: Simplify right side
    643.24x = 342,601.15
  5. Step 5: Solve for x
    x = 342,601.15/643.24
  6. Step 6: Final answer
    x = 532.62

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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.