Home / 1,387.44-2,079.32-1,240.32

Finding the Fourth Proportional to 1,387.44, 2,079.32 and 1,240.32

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Solution

The fourth proportional to 1,387.44, 2,079.32 and 1,240.32 is: 1,858.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.44 : 2,079.32 = 1,240.32 : x
  2. Step 2: Convert to fraction form
    1,387.44/2,079.32 = 1,240.32/x
  3. Step 3: Cross multiply
    1,387.44x = 2,079.32 × 1,240.32
  4. Step 4: Simplify right side
    1,387.44x = 2,579,022.18
  5. Step 5: Solve for x
    x = 2,579,022.18/1,387.44
  6. Step 6: Final answer
    x = 1,858.84

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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.