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Finding the Fourth Proportional to 215.48, 323.40 and 128.92

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Solution

The fourth proportional to 215.48, 323.40 and 128.92 is: 193.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.48 : 323.40 = 128.92 : x
  2. Step 2: Convert to fraction form
    215.48/323.40 = 128.92/x
  3. Step 3: Cross multiply
    215.48x = 323.40 × 128.92
  4. Step 4: Simplify right side
    215.48x = 41,692.73
  5. Step 5: Solve for x
    x = 41,692.73/215.48
  6. Step 6: Final answer
    x = 193.49

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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.