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Finding the Fourth Proportional to 280,278.90, 420,355.31 and 80,554.77

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Solution

The fourth proportional to 280,278.90, 420,355.31 and 80,554.77 is: 120,814.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,278.90 : 420,355.31 = 80,554.77 : x
  2. Step 2: Convert to fraction form
    280,278.90/420,355.31 = 80,554.77/x
  3. Step 3: Cross multiply
    280,278.90x = 420,355.31 × 80,554.77
  4. Step 4: Simplify right side
    280,278.90x = 33,861,624,912.55
  5. Step 5: Solve for x
    x = 33,861,624,912.55/280,278.90
  6. Step 6: Final answer
    x = 120,814.04

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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.