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Finding the Fourth Proportional to 312.34, 431.39 and 213.93

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Solution

The fourth proportional to 312.34, 431.39 and 213.93 is: 295.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.34 : 431.39 = 213.93 : x
  2. Step 2: Convert to fraction form
    312.34/431.39 = 213.93/x
  3. Step 3: Cross multiply
    312.34x = 431.39 × 213.93
  4. Step 4: Simplify right side
    312.34x = 92,287.26
  5. Step 5: Solve for x
    x = 92,287.26/312.34
  6. Step 6: Final answer
    x = 295.47

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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.