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Finding the Fourth Proportional to 398.81, 550.17 and 288.11

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Solution

The fourth proportional to 398.81, 550.17 and 288.11 is: 397.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.81 : 550.17 = 288.11 : x
  2. Step 2: Convert to fraction form
    398.81/550.17 = 288.11/x
  3. Step 3: Cross multiply
    398.81x = 550.17 × 288.11
  4. Step 4: Simplify right side
    398.81x = 158,506.73
  5. Step 5: Solve for x
    x = 158,506.73/398.81
  6. Step 6: Final answer
    x = 397.45

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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.