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Finding the Fourth Proportional to 215.40, 323.28 and 107.25

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Solution

The fourth proportional to 215.40, 323.28 and 107.25 is: 160.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.40 : 323.28 = 107.25 : x
  2. Step 2: Convert to fraction form
    215.40/323.28 = 107.25/x
  3. Step 3: Cross multiply
    215.40x = 323.28 × 107.25
  4. Step 4: Simplify right side
    215.40x = 34,671.78
  5. Step 5: Solve for x
    x = 34,671.78/215.40
  6. Step 6: Final answer
    x = 160.96

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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.