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Finding the Fourth Proportional to 374.60, 561.21 and 220.61

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Solution

The fourth proportional to 374.60, 561.21 and 220.61 is: 330.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.60 : 561.21 = 220.61 : x
  2. Step 2: Convert to fraction form
    374.60/561.21 = 220.61/x
  3. Step 3: Cross multiply
    374.60x = 561.21 × 220.61
  4. Step 4: Simplify right side
    374.60x = 123,808.54
  5. Step 5: Solve for x
    x = 123,808.54/374.60
  6. Step 6: Final answer
    x = 330.51

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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.