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Finding the Fourth Proportional to 199.46, 275.10 and 129.53

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Solution

The fourth proportional to 199.46, 275.10 and 129.53 is: 178.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.46 : 275.10 = 129.53 : x
  2. Step 2: Convert to fraction form
    199.46/275.10 = 129.53/x
  3. Step 3: Cross multiply
    199.46x = 275.10 × 129.53
  4. Step 4: Simplify right side
    199.46x = 35,632.33
  5. Step 5: Solve for x
    x = 35,632.33/199.46
  6. Step 6: Final answer
    x = 178.65

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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.