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Finding the Fourth Proportional to 253.17, 379.89 and 145.17

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Solution

The fourth proportional to 253.17, 379.89 and 145.17 is: 217.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.17 : 379.89 = 145.17 : x
  2. Step 2: Convert to fraction form
    253.17/379.89 = 145.17/x
  3. Step 3: Cross multiply
    253.17x = 379.89 × 145.17
  4. Step 4: Simplify right side
    253.17x = 55,148.63
  5. Step 5: Solve for x
    x = 55,148.63/253.17
  6. Step 6: Final answer
    x = 217.83

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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.