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Finding the Fourth Proportional to 282.70, 389.91 and 212.78

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Solution

The fourth proportional to 282.70, 389.91 and 212.78 is: 293.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.70 : 389.91 = 212.78 : x
  2. Step 2: Convert to fraction form
    282.70/389.91 = 212.78/x
  3. Step 3: Cross multiply
    282.70x = 389.91 × 212.78
  4. Step 4: Simplify right side
    282.70x = 82,965.05
  5. Step 5: Solve for x
    x = 82,965.05/282.70
  6. Step 6: Final answer
    x = 293.47

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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.