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Finding the Fourth Proportional to 643.57, 965.35 and 156.63

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Solution

The fourth proportional to 643.57, 965.35 and 156.63 is: 234.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.57 : 965.35 = 156.63 : x
  2. Step 2: Convert to fraction form
    643.57/965.35 = 156.63/x
  3. Step 3: Cross multiply
    643.57x = 965.35 × 156.63
  4. Step 4: Simplify right side
    643.57x = 151,199.97
  5. Step 5: Solve for x
    x = 151,199.97/643.57
  6. Step 6: Final answer
    x = 234.94

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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.