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Finding the Fourth Proportional to 643.95, 965.61 and 227.43

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Solution

The fourth proportional to 643.95, 965.61 and 227.43 is: 341.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.95 : 965.61 = 227.43 : x
  2. Step 2: Convert to fraction form
    643.95/965.61 = 227.43/x
  3. Step 3: Cross multiply
    643.95x = 965.61 × 227.43
  4. Step 4: Simplify right side
    643.95x = 219,608.68
  5. Step 5: Solve for x
    x = 219,608.68/643.95
  6. Step 6: Final answer
    x = 341.03

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1.5x scale

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.