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Finding the Fourth Proportional to 311.98, 430.68 and 180.94

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Solution

The fourth proportional to 311.98, 430.68 and 180.94 is: 249.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.98 : 430.68 = 180.94 : x
  2. Step 2: Convert to fraction form
    311.98/430.68 = 180.94/x
  3. Step 3: Cross multiply
    311.98x = 430.68 × 180.94
  4. Step 4: Simplify right side
    311.98x = 77,927.24
  5. Step 5: Solve for x
    x = 77,927.24/311.98
  6. Step 6: Final answer
    x = 249.78

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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.