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Finding the Fourth Proportional to 199.72, 275.44 and 129.75

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Solution

The fourth proportional to 199.72, 275.44 and 129.75 is: 178.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.72 : 275.44 = 129.75 : x
  2. Step 2: Convert to fraction form
    199.72/275.44 = 129.75/x
  3. Step 3: Cross multiply
    199.72x = 275.44 × 129.75
  4. Step 4: Simplify right side
    199.72x = 35,738.02
  5. Step 5: Solve for x
    x = 35,738.02/199.72
  6. Step 6: Final answer
    x = 178.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.