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Finding the Fourth Proportional to 288.52, 398.18 and 218.46

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Solution

The fourth proportional to 288.52, 398.18 and 218.46 is: 301.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.52 : 398.18 = 218.46 : x
  2. Step 2: Convert to fraction form
    288.52/398.18 = 218.46/x
  3. Step 3: Cross multiply
    288.52x = 398.18 × 218.46
  4. Step 4: Simplify right side
    288.52x = 86,986.40
  5. Step 5: Solve for x
    x = 86,986.40/288.52
  6. Step 6: Final answer
    x = 301.49

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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.