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Finding the Fourth Proportional to 231.12, 345.72 and 144.24

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Solution

The fourth proportional to 231.12, 345.72 and 144.24 is: 215.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.12 : 345.72 = 144.24 : x
  2. Step 2: Convert to fraction form
    231.12/345.72 = 144.24/x
  3. Step 3: Cross multiply
    231.12x = 345.72 × 144.24
  4. Step 4: Simplify right side
    231.12x = 49,866.65
  5. Step 5: Solve for x
    x = 49,866.65/231.12
  6. Step 6: Final answer
    x = 215.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.