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Finding the Fourth Proportional to 398.41, 548.88 and 315.49

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Solution

The fourth proportional to 398.41, 548.88 and 315.49 is: 434.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.41 : 548.88 = 315.49 : x
  2. Step 2: Convert to fraction form
    398.41/548.88 = 315.49/x
  3. Step 3: Cross multiply
    398.41x = 548.88 × 315.49
  4. Step 4: Simplify right side
    398.41x = 173,166.15
  5. Step 5: Solve for x
    x = 173,166.15/398.41
  6. Step 6: Final answer
    x = 434.64

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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.