Home / 1,081.08-1,621.80-387.54

Finding the Fourth Proportional to 1,081.08, 1,621.80 and 387.54

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Solution

The fourth proportional to 1,081.08, 1,621.80 and 387.54 is: 581.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.08 : 1,621.80 = 387.54 : x
  2. Step 2: Convert to fraction form
    1,081.08/1,621.80 = 387.54/x
  3. Step 3: Cross multiply
    1,081.08x = 1,621.80 × 387.54
  4. Step 4: Simplify right side
    1,081.08x = 628,512.37
  5. Step 5: Solve for x
    x = 628,512.37/1,081.08
  6. Step 6: Final answer
    x = 581.37

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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.