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Finding the Fourth Proportional to 505.17, 757.98 and 261.56

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Solution

The fourth proportional to 505.17, 757.98 and 261.56 is: 392.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.17 : 757.98 = 261.56 : x
  2. Step 2: Convert to fraction form
    505.17/757.98 = 261.56/x
  3. Step 3: Cross multiply
    505.17x = 757.98 × 261.56
  4. Step 4: Simplify right side
    505.17x = 198,256.33
  5. Step 5: Solve for x
    x = 198,256.33/505.17
  6. Step 6: Final answer
    x = 392.46

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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.