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Finding the Fourth Proportional to 505.11, 757.13 and 261.39

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Solution

The fourth proportional to 505.11, 757.13 and 261.39 is: 391.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.11 : 757.13 = 261.39 : x
  2. Step 2: Convert to fraction form
    505.11/757.13 = 261.39/x
  3. Step 3: Cross multiply
    505.11x = 757.13 × 261.39
  4. Step 4: Simplify right side
    505.11x = 197,904.90
  5. Step 5: Solve for x
    x = 197,904.90/505.11
  6. Step 6: Final answer
    x = 391.81

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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.