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Finding the Fourth Proportional to 505.74, 759.15 and 217.38

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Solution

The fourth proportional to 505.74, 759.15 and 217.38 is: 326.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.74 : 759.15 = 217.38 : x
  2. Step 2: Convert to fraction form
    505.74/759.15 = 217.38/x
  3. Step 3: Cross multiply
    505.74x = 759.15 × 217.38
  4. Step 4: Simplify right side
    505.74x = 165,024.03
  5. Step 5: Solve for x
    x = 165,024.03/505.74
  6. Step 6: Final answer
    x = 326.30

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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.