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Finding the Fourth Proportional to 253.20, 349.31 and 154.90

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Solution

The fourth proportional to 253.20, 349.31 and 154.90 is: 213.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.20 : 349.31 = 154.90 : x
  2. Step 2: Convert to fraction form
    253.20/349.31 = 154.90/x
  3. Step 3: Cross multiply
    253.20x = 349.31 × 154.90
  4. Step 4: Simplify right side
    253.20x = 54,108.94
  5. Step 5: Solve for x
    x = 54,108.94/253.20
  6. Step 6: Final answer
    x = 213.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.