Home / 1,081.37-1,621.64-387.86

Finding the Fourth Proportional to 1,081.37, 1,621.64 and 387.86

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Solution

The fourth proportional to 1,081.37, 1,621.64 and 387.86 is: 581.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.37 : 1,621.64 = 387.86 : x
  2. Step 2: Convert to fraction form
    1,081.37/1,621.64 = 387.86/x
  3. Step 3: Cross multiply
    1,081.37x = 1,621.64 × 387.86
  4. Step 4: Simplify right side
    1,081.37x = 628,962.15
  5. Step 5: Solve for x
    x = 628,962.15/1,081.37
  6. Step 6: Final answer
    x = 581.63

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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.