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Finding the Fourth Proportional to 199.86, 275.65 and 129.94

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Solution

The fourth proportional to 199.86, 275.65 and 129.94 is: 179.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.86 : 275.65 = 129.94 : x
  2. Step 2: Convert to fraction form
    199.86/275.65 = 129.94/x
  3. Step 3: Cross multiply
    199.86x = 275.65 × 129.94
  4. Step 4: Simplify right side
    199.86x = 35,816.58
  5. Step 5: Solve for x
    x = 35,816.58/199.86
  6. Step 6: Final answer
    x = 179.21

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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.