Home / 1,081.06-1,621.87-387.79

Finding the Fourth Proportional to 1,081.06, 1,621.87 and 387.79

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Solution

The fourth proportional to 1,081.06, 1,621.87 and 387.79 is: 581.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.06 : 1,621.87 = 387.79 : x
  2. Step 2: Convert to fraction form
    1,081.06/1,621.87 = 387.79/x
  3. Step 3: Cross multiply
    1,081.06x = 1,621.87 × 387.79
  4. Step 4: Simplify right side
    1,081.06x = 628,944.97
  5. Step 5: Solve for x
    x = 628,944.97/1,081.06
  6. Step 6: Final answer
    x = 581.79

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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.