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Finding the Fourth Proportional to 280,426.80, 420,640.20 and 252,433.20

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Solution

The fourth proportional to 280,426.80, 420,640.20 and 252,433.20 is: 378,649.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,426.80 : 420,640.20 = 252,433.20 : x
  2. Step 2: Convert to fraction form
    280,426.80/420,640.20 = 252,433.20/x
  3. Step 3: Cross multiply
    280,426.80x = 420,640.20 × 252,433.20
  4. Step 4: Simplify right side
    280,426.80x = 106,183,551,734.64
  5. Step 5: Solve for x
    x = 106,183,551,734.64/280,426.80
  6. Step 6: Final answer
    x = 378,649.80

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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.