Home / 1,581.36-2,179.60-1,109.40

Finding the Fourth Proportional to 1,581.36, 2,179.60 and 1,109.40

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Solution

The fourth proportional to 1,581.36, 2,179.60 and 1,109.40 is: 1,529.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.36 : 2,179.60 = 1,109.40 : x
  2. Step 2: Convert to fraction form
    1,581.36/2,179.60 = 1,109.40/x
  3. Step 3: Cross multiply
    1,581.36x = 2,179.60 × 1,109.40
  4. Step 4: Simplify right side
    1,581.36x = 2,418,048.24
  5. Step 5: Solve for x
    x = 2,418,048.24/1,581.36
  6. Step 6: Final answer
    x = 1,529.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.