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Finding the Fourth Proportional to 643.36, 965.28 and 354.72

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Solution

The fourth proportional to 643.36, 965.28 and 354.72 is: 532.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.36 : 965.28 = 354.72 : x
  2. Step 2: Convert to fraction form
    643.36/965.28 = 354.72/x
  3. Step 3: Cross multiply
    643.36x = 965.28 × 354.72
  4. Step 4: Simplify right side
    643.36x = 342,404.12
  5. Step 5: Solve for x
    x = 342,404.12/643.36
  6. Step 6: Final answer
    x = 532.21

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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.