Home / 280,072.20-420,106.12-69,708.72

Finding the Fourth Proportional to 280,072.20, 420,106.12 and 69,708.72

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Solution

The fourth proportional to 280,072.20, 420,106.12 and 69,708.72 is: 104,562.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,072.20 : 420,106.12 = 69,708.72 : x
  2. Step 2: Convert to fraction form
    280,072.20/420,106.12 = 69,708.72/x
  3. Step 3: Cross multiply
    280,072.20x = 420,106.12 × 69,708.72
  4. Step 4: Simplify right side
    280,072.20x = 29,285,059,889.37
  5. Step 5: Solve for x
    x = 29,285,059,889.37/280,072.20
  6. Step 6: Final answer
    x = 104,562.54

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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.