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Finding the Fourth Proportional to 288.94, 398.78 and 164.61

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Solution

The fourth proportional to 288.94, 398.78 and 164.61 is: 227.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.94 : 398.78 = 164.61 : x
  2. Step 2: Convert to fraction form
    288.94/398.78 = 164.61/x
  3. Step 3: Cross multiply
    288.94x = 398.78 × 164.61
  4. Step 4: Simplify right side
    288.94x = 65,644.25
  5. Step 5: Solve for x
    x = 65,644.25/288.94
  6. Step 6: Final answer
    x = 227.19

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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.