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Finding the Fourth Proportional to 215.10, 320.27 and 213.90

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Solution

The fourth proportional to 215.10, 320.27 and 213.90 is: 318.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.10 : 320.27 = 213.90 : x
  2. Step 2: Convert to fraction form
    215.10/320.27 = 213.90/x
  3. Step 3: Cross multiply
    215.10x = 320.27 × 213.90
  4. Step 4: Simplify right side
    215.10x = 68,504.68
  5. Step 5: Solve for x
    x = 68,504.68/215.10
  6. Step 6: Final answer
    x = 318.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.