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Finding the Fourth Proportional to 398.18, 549.62 and 274.25

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Solution

The fourth proportional to 398.18, 549.62 and 274.25 is: 378.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.18 : 549.62 = 274.25 : x
  2. Step 2: Convert to fraction form
    398.18/549.62 = 274.25/x
  3. Step 3: Cross multiply
    398.18x = 549.62 × 274.25
  4. Step 4: Simplify right side
    398.18x = 150,733.29
  5. Step 5: Solve for x
    x = 150,733.29/398.18
  6. Step 6: Final answer
    x = 378.56

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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.