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Finding the Fourth Proportional to 312.90, 431.82 and 271.59

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Solution

The fourth proportional to 312.90, 431.82 and 271.59 is: 374.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.90 : 431.82 = 271.59 : x
  2. Step 2: Convert to fraction form
    312.90/431.82 = 271.59/x
  3. Step 3: Cross multiply
    312.90x = 431.82 × 271.59
  4. Step 4: Simplify right side
    312.90x = 117,277.99
  5. Step 5: Solve for x
    x = 117,277.99/312.90
  6. Step 6: Final answer
    x = 374.81

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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.