Home / 280,115.28-420,048.98-80,389.33

Finding the Fourth Proportional to 280,115.28, 420,048.98 and 80,389.33

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Solution

The fourth proportional to 280,115.28, 420,048.98 and 80,389.33 is: 120,548.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,115.28 : 420,048.98 = 80,389.33 : x
  2. Step 2: Convert to fraction form
    280,115.28/420,048.98 = 80,389.33/x
  3. Step 3: Cross multiply
    280,115.28x = 420,048.98 × 80,389.33
  4. Step 4: Simplify right side
    280,115.28x = 33,767,453,969.14
  5. Step 5: Solve for x
    x = 33,767,453,969.14/280,115.28
  6. Step 6: Final answer
    x = 120,548.42

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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.