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Finding the Fourth Proportional to 643.38, 965.13 and 210.53

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Solution

The fourth proportional to 643.38, 965.13 and 210.53 is: 315.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.38 : 965.13 = 210.53 : x
  2. Step 2: Convert to fraction form
    643.38/965.13 = 210.53/x
  3. Step 3: Cross multiply
    643.38x = 965.13 × 210.53
  4. Step 4: Simplify right side
    643.38x = 203,188.82
  5. Step 5: Solve for x
    x = 203,188.82/643.38
  6. Step 6: Final answer
    x = 315.82

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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.