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Finding the Fourth Proportional to 259.45, 388.85 and 122.20

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Solution

The fourth proportional to 259.45, 388.85 and 122.20 is: 183.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.45 : 388.85 = 122.20 : x
  2. Step 2: Convert to fraction form
    259.45/388.85 = 122.20/x
  3. Step 3: Cross multiply
    259.45x = 388.85 × 122.20
  4. Step 4: Simplify right side
    259.45x = 47,517.47
  5. Step 5: Solve for x
    x = 47,517.47/259.45
  6. Step 6: Final answer
    x = 183.15

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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.