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Finding the Fourth Proportional to 505.89, 758.57 and 213.30

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Solution

The fourth proportional to 505.89, 758.57 and 213.30 is: 319.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.89 : 758.57 = 213.30 : x
  2. Step 2: Convert to fraction form
    505.89/758.57 = 213.30/x
  3. Step 3: Cross multiply
    505.89x = 758.57 × 213.30
  4. Step 4: Simplify right side
    505.89x = 161,801.91
  5. Step 5: Solve for x
    x = 161,801.91/505.89
  6. Step 6: Final answer
    x = 319.84

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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.