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Finding the Fourth Proportional to 311.88, 430.36 and 179.12

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Solution

The fourth proportional to 311.88, 430.36 and 179.12 is: 247.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.88 : 430.36 = 179.12 : x
  2. Step 2: Convert to fraction form
    311.88/430.36 = 179.12/x
  3. Step 3: Cross multiply
    311.88x = 430.36 × 179.12
  4. Step 4: Simplify right side
    311.88x = 77,086.08
  5. Step 5: Solve for x
    x = 77,086.08/311.88
  6. Step 6: Final answer
    x = 247.17

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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.