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Finding the Fourth Proportional to 288.71, 398.42 and 164.36

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Solution

The fourth proportional to 288.71, 398.42 and 164.36 is: 226.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.71 : 398.42 = 164.36 : x
  2. Step 2: Convert to fraction form
    288.71/398.42 = 164.36/x
  3. Step 3: Cross multiply
    288.71x = 398.42 × 164.36
  4. Step 4: Simplify right side
    288.71x = 65,484.31
  5. Step 5: Solve for x
    x = 65,484.31/288.71
  6. Step 6: Final answer
    x = 226.82

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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.