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Finding the Fourth Proportional to 422.51, 633.92 and 191.38

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Solution

The fourth proportional to 422.51, 633.92 and 191.38 is: 287.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.51 : 633.92 = 191.38 : x
  2. Step 2: Convert to fraction form
    422.51/633.92 = 191.38/x
  3. Step 3: Cross multiply
    422.51x = 633.92 × 191.38
  4. Step 4: Simplify right side
    422.51x = 121,319.61
  5. Step 5: Solve for x
    x = 121,319.61/422.51
  6. Step 6: Final answer
    x = 287.14

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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.