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Finding the Fourth Proportional to 253.40, 380.11 and 143.62

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Solution

The fourth proportional to 253.40, 380.11 and 143.62 is: 215.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.40 : 380.11 = 143.62 : x
  2. Step 2: Convert to fraction form
    253.40/380.11 = 143.62/x
  3. Step 3: Cross multiply
    253.40x = 380.11 × 143.62
  4. Step 4: Simplify right side
    253.40x = 54,590.09
  5. Step 5: Solve for x
    x = 54,590.09/253.40
  6. Step 6: Final answer
    x = 215.43

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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.