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Finding the Fourth Proportional to 259.50, 389.24 and 220.89

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Solution

The fourth proportional to 259.50, 389.24 and 220.89 is: 331.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.50 : 389.24 = 220.89 : x
  2. Step 2: Convert to fraction form
    259.50/389.24 = 220.89/x
  3. Step 3: Cross multiply
    259.50x = 389.24 × 220.89
  4. Step 4: Simplify right side
    259.50x = 85,978.12
  5. Step 5: Solve for x
    x = 85,978.12/259.50
  6. Step 6: Final answer
    x = 331.32

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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.