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Finding the Fourth Proportional to 312.61, 431.37 and 290.27

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Solution

The fourth proportional to 312.61, 431.37 and 290.27 is: 400.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.61 : 431.37 = 290.27 : x
  2. Step 2: Convert to fraction form
    312.61/431.37 = 290.27/x
  3. Step 3: Cross multiply
    312.61x = 431.37 × 290.27
  4. Step 4: Simplify right side
    312.61x = 125,213.77
  5. Step 5: Solve for x
    x = 125,213.77/312.61
  6. Step 6: Final answer
    x = 400.54

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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.