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Finding the Fourth Proportional to 312.82, 431.82 and 258.16

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Solution

The fourth proportional to 312.82, 431.82 and 258.16 is: 356.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.82 : 431.82 = 258.16 : x
  2. Step 2: Convert to fraction form
    312.82/431.82 = 258.16/x
  3. Step 3: Cross multiply
    312.82x = 431.82 × 258.16
  4. Step 4: Simplify right side
    312.82x = 111,478.65
  5. Step 5: Solve for x
    x = 111,478.65/312.82
  6. Step 6: Final answer
    x = 356.37

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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.