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Finding the Fourth Proportional to 215.82, 298.59 and 189.99

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Solution

The fourth proportional to 215.82, 298.59 and 189.99 is: 262.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.82 : 298.59 = 189.99 : x
  2. Step 2: Convert to fraction form
    215.82/298.59 = 189.99/x
  3. Step 3: Cross multiply
    215.82x = 298.59 × 189.99
  4. Step 4: Simplify right side
    215.82x = 56,729.11
  5. Step 5: Solve for x
    x = 56,729.11/215.82
  6. Step 6: Final answer
    x = 262.85

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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.