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Finding the Fourth Proportional to 422.47, 633.23 and 191.55

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Solution

The fourth proportional to 422.47, 633.23 and 191.55 is: 287.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.47 : 633.23 = 191.55 : x
  2. Step 2: Convert to fraction form
    422.47/633.23 = 191.55/x
  3. Step 3: Cross multiply
    422.47x = 633.23 × 191.55
  4. Step 4: Simplify right side
    422.47x = 121,295.21
  5. Step 5: Solve for x
    x = 121,295.21/422.47
  6. Step 6: Final answer
    x = 287.11

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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.