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Finding the Fourth Proportional to 311.94, 430.54 and 180.97

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Solution

The fourth proportional to 311.94, 430.54 and 180.97 is: 249.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.94 : 430.54 = 180.97 : x
  2. Step 2: Convert to fraction form
    311.94/430.54 = 180.97/x
  3. Step 3: Cross multiply
    311.94x = 430.54 × 180.97
  4. Step 4: Simplify right side
    311.94x = 77,913.30
  5. Step 5: Solve for x
    x = 77,913.30/311.94
  6. Step 6: Final answer
    x = 249.77

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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.