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Finding the Fourth Proportional to 253.40, 380.31 and 217.07

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Solution

The fourth proportional to 253.40, 380.31 and 217.07 is: 325.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.40 : 380.31 = 217.07 : x
  2. Step 2: Convert to fraction form
    253.40/380.31 = 217.07/x
  3. Step 3: Cross multiply
    253.40x = 380.31 × 217.07
  4. Step 4: Simplify right side
    253.40x = 82,550.90
  5. Step 5: Solve for x
    x = 82,550.90/253.40
  6. Step 6: Final answer
    x = 325.78

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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.