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Finding the Fourth Proportional to 259.72, 388.77 and 220.84

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Solution

The fourth proportional to 259.72, 388.77 and 220.84 is: 330.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.72 : 388.77 = 220.84 : x
  2. Step 2: Convert to fraction form
    259.72/388.77 = 220.84/x
  3. Step 3: Cross multiply
    259.72x = 388.77 × 220.84
  4. Step 4: Simplify right side
    259.72x = 85,855.97
  5. Step 5: Solve for x
    x = 85,855.97/259.72
  6. Step 6: Final answer
    x = 330.57

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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.