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Finding the Fourth Proportional to 199.76, 275.60 and 129.90

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Solution

The fourth proportional to 199.76, 275.60 and 129.90 is: 179.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.76 : 275.60 = 129.90 : x
  2. Step 2: Convert to fraction form
    199.76/275.60 = 129.90/x
  3. Step 3: Cross multiply
    199.76x = 275.60 × 129.90
  4. Step 4: Simplify right side
    199.76x = 35,799.79
  5. Step 5: Solve for x
    x = 35,799.79/199.76
  6. Step 6: Final answer
    x = 179.22

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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.