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Finding the Fourth Proportional to 306.18, 422.56 and 207.90

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Solution

The fourth proportional to 306.18, 422.56 and 207.90 is: 286.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.18 : 422.56 = 207.90 : x
  2. Step 2: Convert to fraction form
    306.18/422.56 = 207.90/x
  3. Step 3: Cross multiply
    306.18x = 422.56 × 207.90
  4. Step 4: Simplify right side
    306.18x = 87,850.22
  5. Step 5: Solve for x
    x = 87,850.22/306.18
  6. Step 6: Final answer
    x = 286.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.