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Finding the Fourth Proportional to 280,776.70, 421,120.50 and 91,241.56

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Solution

The fourth proportional to 280,776.70, 421,120.50 and 91,241.56 is: 136,847.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,776.70 : 421,120.50 = 91,241.56 : x
  2. Step 2: Convert to fraction form
    280,776.70/421,120.50 = 91,241.56/x
  3. Step 3: Cross multiply
    280,776.70x = 421,120.50 × 91,241.56
  4. Step 4: Simplify right side
    280,776.70x = 38,423,691,367.98
  5. Step 5: Solve for x
    x = 38,423,691,367.98/280,776.70
  6. Step 6: Final answer
    x = 136,847.86

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1.5x scale

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.