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Finding the Fourth Proportional to 505.05, 757.19 and 261.42

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Solution

The fourth proportional to 505.05, 757.19 and 261.42 is: 391.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.05 : 757.19 = 261.42 : x
  2. Step 2: Convert to fraction form
    505.05/757.19 = 261.42/x
  3. Step 3: Cross multiply
    505.05x = 757.19 × 261.42
  4. Step 4: Simplify right side
    505.05x = 197,943.30
  5. Step 5: Solve for x
    x = 197,943.30/505.05
  6. Step 6: Final answer
    x = 391.93

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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.