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Finding the Fourth Proportional to 255.92, 382 and 221.68

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Solution

The fourth proportional to 255.92, 382 and 221.68 is: 330.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.92 : 382 = 221.68 : x
  2. Step 2: Convert to fraction form
    255.92/382 = 221.68/x
  3. Step 3: Cross multiply
    255.92x = 382 × 221.68
  4. Step 4: Simplify right side
    255.92x = 84,681.76
  5. Step 5: Solve for x
    x = 84,681.76/255.92
  6. Step 6: Final answer
    x = 330.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.