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Finding the Fourth Proportional to 215.90, 323.60 and 113.30

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Solution

The fourth proportional to 215.90, 323.60 and 113.30 is: 169.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.90 : 323.60 = 113.30 : x
  2. Step 2: Convert to fraction form
    215.90/323.60 = 113.30/x
  3. Step 3: Cross multiply
    215.90x = 323.60 × 113.30
  4. Step 4: Simplify right side
    215.90x = 36,662.91
  5. Step 5: Solve for x
    x = 36,662.91/215.90
  6. Step 6: Final answer
    x = 169.82

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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.