Home / 1,431.87-2,150.22-939.12

Finding the Fourth Proportional to 1,431.87, 2,150.22 and 939.12

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Solution

The fourth proportional to 1,431.87, 2,150.22 and 939.12 is: 1,410.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.87 : 2,150.22 = 939.12 : x
  2. Step 2: Convert to fraction form
    1,431.87/2,150.22 = 939.12/x
  3. Step 3: Cross multiply
    1,431.87x = 2,150.22 × 939.12
  4. Step 4: Simplify right side
    1,431.87x = 2,019,314.61
  5. Step 5: Solve for x
    x = 2,019,314.61/1,431.87
  6. Step 6: Final answer
    x = 1,410.26

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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.