Home / 280,845.16-421,205.66-81,122.20

Finding the Fourth Proportional to 280,845.16, 421,205.66 and 81,122.20

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Solution

The fourth proportional to 280,845.16, 421,205.66 and 81,122.20 is: 121,665.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,845.16 : 421,205.66 = 81,122.20 : x
  2. Step 2: Convert to fraction form
    280,845.16/421,205.66 = 81,122.20/x
  3. Step 3: Cross multiply
    280,845.16x = 421,205.66 × 81,122.20
  4. Step 4: Simplify right side
    280,845.16x = 34,169,129,791.65
  5. Step 5: Solve for x
    x = 34,169,129,791.65/280,845.16
  6. Step 6: Final answer
    x = 121,665.37

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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.