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Finding the Fourth Proportional to 282.31, 422.86 and 213.07

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Solution

The fourth proportional to 282.31, 422.86 and 213.07 is: 319.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.31 : 422.86 = 213.07 : x
  2. Step 2: Convert to fraction form
    282.31/422.86 = 213.07/x
  3. Step 3: Cross multiply
    282.31x = 422.86 × 213.07
  4. Step 4: Simplify right side
    282.31x = 90,098.78
  5. Step 5: Solve for x
    x = 90,098.78/282.31
  6. Step 6: Final answer
    x = 319.15

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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.