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Finding the Fourth Proportional to 505.35, 757.47 and 212.78

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Solution

The fourth proportional to 505.35, 757.47 and 212.78 is: 318.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.35 : 757.47 = 212.78 : x
  2. Step 2: Convert to fraction form
    505.35/757.47 = 212.78/x
  3. Step 3: Cross multiply
    505.35x = 757.47 × 212.78
  4. Step 4: Simplify right side
    505.35x = 161,170.68
  5. Step 5: Solve for x
    x = 161,170.68/505.35
  6. Step 6: Final answer
    x = 318.93

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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.