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Finding the Fourth Proportional to 351.72, 487.37 and 347.31

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Solution

The fourth proportional to 351.72, 487.37 and 347.31 is: 481.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.72 : 487.37 = 347.31 : x
  2. Step 2: Convert to fraction form
    351.72/487.37 = 347.31/x
  3. Step 3: Cross multiply
    351.72x = 487.37 × 347.31
  4. Step 4: Simplify right side
    351.72x = 169,266.74
  5. Step 5: Solve for x
    x = 169,266.74/351.72
  6. Step 6: Final answer
    x = 481.25

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.