Home / 1,081.04-1,621.38-387.60

Finding the Fourth Proportional to 1,081.04, 1,621.38 and 387.60

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Solution

The fourth proportional to 1,081.04, 1,621.38 and 387.60 is: 581.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.04 : 1,621.38 = 387.60 : x
  2. Step 2: Convert to fraction form
    1,081.04/1,621.38 = 387.60/x
  3. Step 3: Cross multiply
    1,081.04x = 1,621.38 × 387.60
  4. Step 4: Simplify right side
    1,081.04x = 628,445.92
  5. Step 5: Solve for x
    x = 628,445.92/1,081.04
  6. Step 6: Final answer
    x = 581.34

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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.