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Finding the Fourth Proportional to 288.98, 398.61 and 226.71

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Solution

The fourth proportional to 288.98, 398.61 and 226.71 is: 312.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.98 : 398.61 = 226.71 : x
  2. Step 2: Convert to fraction form
    288.98/398.61 = 226.71/x
  3. Step 3: Cross multiply
    288.98x = 398.61 × 226.71
  4. Step 4: Simplify right side
    288.98x = 90,368.87
  5. Step 5: Solve for x
    x = 90,368.87/288.98
  6. Step 6: Final answer
    x = 312.72

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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.