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Finding the Fourth Proportional to 215.76, 323.79 and 142.48

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Solution

The fourth proportional to 215.76, 323.79 and 142.48 is: 213.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.76 : 323.79 = 142.48 : x
  2. Step 2: Convert to fraction form
    215.76/323.79 = 142.48/x
  3. Step 3: Cross multiply
    215.76x = 323.79 × 142.48
  4. Step 4: Simplify right side
    215.76x = 46,133.60
  5. Step 5: Solve for x
    x = 46,133.60/215.76
  6. Step 6: Final answer
    x = 213.82

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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.