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Finding the Fourth Proportional to 258.64, 387.70 and 221.94

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Solution

The fourth proportional to 258.64, 387.70 and 221.94 is: 332.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.64 : 387.70 = 221.94 : x
  2. Step 2: Convert to fraction form
    258.64/387.70 = 221.94/x
  3. Step 3: Cross multiply
    258.64x = 387.70 × 221.94
  4. Step 4: Simplify right side
    258.64x = 86,046.14
  5. Step 5: Solve for x
    x = 86,046.14/258.64
  6. Step 6: Final answer
    x = 332.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.