Home / 1,081.05-1,621.60-387.77

Finding the Fourth Proportional to 1,081.05, 1,621.60 and 387.77

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Solution

The fourth proportional to 1,081.05, 1,621.60 and 387.77 is: 581.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.05 : 1,621.60 = 387.77 : x
  2. Step 2: Convert to fraction form
    1,081.05/1,621.60 = 387.77/x
  3. Step 3: Cross multiply
    1,081.05x = 1,621.60 × 387.77
  4. Step 4: Simplify right side
    1,081.05x = 628,799.72
  5. Step 5: Solve for x
    x = 628,799.72/1,081.05
  6. Step 6: Final answer
    x = 581.66

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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.