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Finding the Fourth Proportional to 505.56, 758.48 and 212.91

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Solution

The fourth proportional to 505.56, 758.48 and 212.91 is: 319.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.56 : 758.48 = 212.91 : x
  2. Step 2: Convert to fraction form
    505.56/758.48 = 212.91/x
  3. Step 3: Cross multiply
    505.56x = 758.48 × 212.91
  4. Step 4: Simplify right side
    505.56x = 161,489.53
  5. Step 5: Solve for x
    x = 161,489.53/505.56
  6. Step 6: Final answer
    x = 319.43

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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.