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Finding the Fourth Proportional to 215.28, 299.15 and 213.06

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Solution

The fourth proportional to 215.28, 299.15 and 213.06 is: 296.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.28 : 299.15 = 213.06 : x
  2. Step 2: Convert to fraction form
    215.28/299.15 = 213.06/x
  3. Step 3: Cross multiply
    215.28x = 299.15 × 213.06
  4. Step 4: Simplify right side
    215.28x = 63,737.43
  5. Step 5: Solve for x
    x = 63,737.43/215.28
  6. Step 6: Final answer
    x = 296.07

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.