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Finding the Fourth Proportional to 397.87, 547.74 and 342.39

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Solution

The fourth proportional to 397.87, 547.74 and 342.39 is: 471.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.87 : 547.74 = 342.39 : x
  2. Step 2: Convert to fraction form
    397.87/547.74 = 342.39/x
  3. Step 3: Cross multiply
    397.87x = 547.74 × 342.39
  4. Step 4: Simplify right side
    397.87x = 187,540.70
  5. Step 5: Solve for x
    x = 187,540.70/397.87
  6. Step 6: Final answer
    x = 471.36

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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.