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Finding the Fourth Proportional to 398.68, 550.10 and 272.50

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Solution

The fourth proportional to 398.68, 550.10 and 272.50 is: 376.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.68 : 550.10 = 272.50 : x
  2. Step 2: Convert to fraction form
    398.68/550.10 = 272.50/x
  3. Step 3: Cross multiply
    398.68x = 550.10 × 272.50
  4. Step 4: Simplify right side
    398.68x = 149,902.53
  5. Step 5: Solve for x
    x = 149,902.53/398.68
  6. Step 6: Final answer
    x = 376.00

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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.