Home / 1,388.28-2,079.68-1,113.08

Finding the Fourth Proportional to 1,388.28, 2,079.68 and 1,113.08

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Solution

The fourth proportional to 1,388.28, 2,079.68 and 1,113.08 is: 1,667.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.28 : 2,079.68 = 1,113.08 : x
  2. Step 2: Convert to fraction form
    1,388.28/2,079.68 = 1,113.08/x
  3. Step 3: Cross multiply
    1,388.28x = 2,079.68 × 1,113.08
  4. Step 4: Simplify right side
    1,388.28x = 2,314,850.21
  5. Step 5: Solve for x
    x = 2,314,850.21/1,388.28
  6. Step 6: Final answer
    x = 1,667.42

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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.