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Finding the Fourth Proportional to 311.88, 429.99 and 255.65

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Solution

The fourth proportional to 311.88, 429.99 and 255.65 is: 352.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.88 : 429.99 = 255.65 : x
  2. Step 2: Convert to fraction form
    311.88/429.99 = 255.65/x
  3. Step 3: Cross multiply
    311.88x = 429.99 × 255.65
  4. Step 4: Simplify right side
    311.88x = 109,926.52
  5. Step 5: Solve for x
    x = 109,926.52/311.88
  6. Step 6: Final answer
    x = 352.47

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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.