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Finding the Fourth Proportional to 398.14, 548.91 and 287.64

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Solution

The fourth proportional to 398.14, 548.91 and 287.64 is: 396.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.14 : 548.91 = 287.64 : x
  2. Step 2: Convert to fraction form
    398.14/548.91 = 287.64/x
  3. Step 3: Cross multiply
    398.14x = 548.91 × 287.64
  4. Step 4: Simplify right side
    398.14x = 157,888.47
  5. Step 5: Solve for x
    x = 157,888.47/398.14
  6. Step 6: Final answer
    x = 396.57

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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.