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Finding the Fourth Proportional to 280.91, 421.49 and 126.80

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Solution

The fourth proportional to 280.91, 421.49 and 126.80 is: 190.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.91 : 421.49 = 126.80 : x
  2. Step 2: Convert to fraction form
    280.91/421.49 = 126.80/x
  3. Step 3: Cross multiply
    280.91x = 421.49 × 126.80
  4. Step 4: Simplify right side
    280.91x = 53,444.93
  5. Step 5: Solve for x
    x = 53,444.93/280.91
  6. Step 6: Final answer
    x = 190.26

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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.