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Finding the Fourth Proportional to 398.25, 548.26 and 342.77

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Solution

The fourth proportional to 398.25, 548.26 and 342.77 is: 471.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.25 : 548.26 = 342.77 : x
  2. Step 2: Convert to fraction form
    398.25/548.26 = 342.77/x
  3. Step 3: Cross multiply
    398.25x = 548.26 × 342.77
  4. Step 4: Simplify right side
    398.25x = 187,927.08
  5. Step 5: Solve for x
    x = 187,927.08/398.25
  6. Step 6: Final answer
    x = 471.88

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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.