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Finding the Fourth Proportional to 220.24, 330 and 128.98

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Solution

The fourth proportional to 220.24, 330 and 128.98 is: 193.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.24 : 330 = 128.98 : x
  2. Step 2: Convert to fraction form
    220.24/330 = 128.98/x
  3. Step 3: Cross multiply
    220.24x = 330 × 128.98
  4. Step 4: Simplify right side
    220.24x = 42,563.40
  5. Step 5: Solve for x
    x = 42,563.40/220.24
  6. Step 6: Final answer
    x = 193.26

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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.