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Finding the Fourth Proportional to 280.74, 421.11 and 107.49

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Solution

The fourth proportional to 280.74, 421.11 and 107.49 is: 161.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.74 : 421.11 = 107.49 : x
  2. Step 2: Convert to fraction form
    280.74/421.11 = 107.49/x
  3. Step 3: Cross multiply
    280.74x = 421.11 × 107.49
  4. Step 4: Simplify right side
    280.74x = 45,265.11
  5. Step 5: Solve for x
    x = 45,265.11/280.74
  6. Step 6: Final answer
    x = 161.24

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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.