Home / 1,581.05-2,178.90-1,138.19

Finding the Fourth Proportional to 1,581.05, 2,178.90 and 1,138.19

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Solution

The fourth proportional to 1,581.05, 2,178.90 and 1,138.19 is: 1,568.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.05 : 2,178.90 = 1,138.19 : x
  2. Step 2: Convert to fraction form
    1,581.05/2,178.90 = 1,138.19/x
  3. Step 3: Cross multiply
    1,581.05x = 2,178.90 × 1,138.19
  4. Step 4: Simplify right side
    1,581.05x = 2,479,991.30
  5. Step 5: Solve for x
    x = 2,479,991.30/1,581.05
  6. Step 6: Final answer
    x = 1,568.57

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1.5x scale

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.