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Finding the Fourth Proportional to 253.42, 379.12 and 219.56

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Solution

The fourth proportional to 253.42, 379.12 and 219.56 is: 328.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.42 : 379.12 = 219.56 : x
  2. Step 2: Convert to fraction form
    253.42/379.12 = 219.56/x
  3. Step 3: Cross multiply
    253.42x = 379.12 × 219.56
  4. Step 4: Simplify right side
    253.42x = 83,239.59
  5. Step 5: Solve for x
    x = 83,239.59/253.42
  6. Step 6: Final answer
    x = 328.46

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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.