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Finding the Fourth Proportional to 280.98, 421.43 and 126.90

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Solution

The fourth proportional to 280.98, 421.43 and 126.90 is: 190.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.98 : 421.43 = 126.90 : x
  2. Step 2: Convert to fraction form
    280.98/421.43 = 126.90/x
  3. Step 3: Cross multiply
    280.98x = 421.43 × 126.90
  4. Step 4: Simplify right side
    280.98x = 53,478.83
  5. Step 5: Solve for x
    x = 53,478.83/280.98
  6. Step 6: Final answer
    x = 190.33

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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.