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Finding the Fourth Proportional to 312.47, 431.17 and 181.48

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Solution

The fourth proportional to 312.47, 431.17 and 181.48 is: 250.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.47 : 431.17 = 181.48 : x
  2. Step 2: Convert to fraction form
    312.47/431.17 = 181.48/x
  3. Step 3: Cross multiply
    312.47x = 431.17 × 181.48
  4. Step 4: Simplify right side
    312.47x = 78,249.19
  5. Step 5: Solve for x
    x = 78,249.19/312.47
  6. Step 6: Final answer
    x = 250.43

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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.