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Finding the Fourth Proportional to 261.66, 391.31 and 199.98

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Solution

The fourth proportional to 261.66, 391.31 and 199.98 is: 299.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.66 : 391.31 = 199.98 : x
  2. Step 2: Convert to fraction form
    261.66/391.31 = 199.98/x
  3. Step 3: Cross multiply
    261.66x = 391.31 × 199.98
  4. Step 4: Simplify right side
    261.66x = 78,253.17
  5. Step 5: Solve for x
    x = 78,253.17/261.66
  6. Step 6: Final answer
    x = 299.06

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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.