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Finding the Fourth Proportional to 374.20, 561.39 and 220.25

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Solution

The fourth proportional to 374.20, 561.39 and 220.25 is: 330.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.20 : 561.39 = 220.25 : x
  2. Step 2: Convert to fraction form
    374.20/561.39 = 220.25/x
  3. Step 3: Cross multiply
    374.20x = 561.39 × 220.25
  4. Step 4: Simplify right side
    374.20x = 123,646.15
  5. Step 5: Solve for x
    x = 123,646.15/374.20
  6. Step 6: Final answer
    x = 330.43

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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.