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Finding the Fourth Proportional to 215.88, 299.18 and 211.79

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Solution

The fourth proportional to 215.88, 299.18 and 211.79 is: 293.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.88 : 299.18 = 211.79 : x
  2. Step 2: Convert to fraction form
    215.88/299.18 = 211.79/x
  3. Step 3: Cross multiply
    215.88x = 299.18 × 211.79
  4. Step 4: Simplify right side
    215.88x = 63,360.78
  5. Step 5: Solve for x
    x = 63,360.78/215.88
  6. Step 6: Final answer
    x = 293.50

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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.