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Finding the Fourth Proportional to 398.06, 548.13 and 314.91

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Solution

The fourth proportional to 398.06, 548.13 and 314.91 is: 433.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.06 : 548.13 = 314.91 : x
  2. Step 2: Convert to fraction form
    398.06/548.13 = 314.91/x
  3. Step 3: Cross multiply
    398.06x = 548.13 × 314.91
  4. Step 4: Simplify right side
    398.06x = 172,611.62
  5. Step 5: Solve for x
    x = 172,611.62/398.06
  6. Step 6: Final answer
    x = 433.63

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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.