Home / 280,511.37-420,669.05-80,778.33

Finding the Fourth Proportional to 280,511.37, 420,669.05 and 80,778.33

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Solution

The fourth proportional to 280,511.37, 420,669.05 and 80,778.33 is: 121,139.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,511.37 : 420,669.05 = 80,778.33 : x
  2. Step 2: Convert to fraction form
    280,511.37/420,669.05 = 80,778.33/x
  3. Step 3: Cross multiply
    280,511.37x = 420,669.05 × 80,778.33
  4. Step 4: Simplify right side
    280,511.37x = 33,980,942,937.79
  5. Step 5: Solve for x
    x = 33,980,942,937.79/280,511.37
  6. Step 6: Final answer
    x = 121,139.27

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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.