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Finding the Fourth Proportional to 344.56, 517.20 and 128.20

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Solution

The fourth proportional to 344.56, 517.20 and 128.20 is: 192.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.56 : 517.20 = 128.20 : x
  2. Step 2: Convert to fraction form
    344.56/517.20 = 128.20/x
  3. Step 3: Cross multiply
    344.56x = 517.20 × 128.20
  4. Step 4: Simplify right side
    344.56x = 66,305.04
  5. Step 5: Solve for x
    x = 66,305.04/344.56
  6. Step 6: Final answer
    x = 192.43

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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.