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Finding the Fourth Proportional to 261.19, 391.46 and 199.03

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Solution

The fourth proportional to 261.19, 391.46 and 199.03 is: 298.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.19 : 391.46 = 199.03 : x
  2. Step 2: Convert to fraction form
    261.19/391.46 = 199.03/x
  3. Step 3: Cross multiply
    261.19x = 391.46 × 199.03
  4. Step 4: Simplify right side
    261.19x = 77,912.28
  5. Step 5: Solve for x
    x = 77,912.28/261.19
  6. Step 6: Final answer
    x = 298.30

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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.