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Finding the Fourth Proportional to 398.95, 550.80 and 274.57

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Solution

The fourth proportional to 398.95, 550.80 and 274.57 is: 379.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.95 : 550.80 = 274.57 : x
  2. Step 2: Convert to fraction form
    398.95/550.80 = 274.57/x
  3. Step 3: Cross multiply
    398.95x = 550.80 × 274.57
  4. Step 4: Simplify right side
    398.95x = 151,233.16
  5. Step 5: Solve for x
    x = 151,233.16/398.95
  6. Step 6: Final answer
    x = 379.08

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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.