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Finding the Fourth Proportional to 215.99, 298.39 and 142.48

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Solution

The fourth proportional to 215.99, 298.39 and 142.48 is: 196.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.99 : 298.39 = 142.48 : x
  2. Step 2: Convert to fraction form
    215.99/298.39 = 142.48/x
  3. Step 3: Cross multiply
    215.99x = 298.39 × 142.48
  4. Step 4: Simplify right side
    215.99x = 42,514.61
  5. Step 5: Solve for x
    x = 42,514.61/215.99
  6. Step 6: Final answer
    x = 196.84

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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.