Home / 1,380.36-1,907.62-1,131.28

Finding the Fourth Proportional to 1,380.36, 1,907.62 and 1,131.28

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Solution

The fourth proportional to 1,380.36, 1,907.62 and 1,131.28 is: 1,563.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.36 : 1,907.62 = 1,131.28 : x
  2. Step 2: Convert to fraction form
    1,380.36/1,907.62 = 1,131.28/x
  3. Step 3: Cross multiply
    1,380.36x = 1,907.62 × 1,131.28
  4. Step 4: Simplify right side
    1,380.36x = 2,158,052.35
  5. Step 5: Solve for x
    x = 2,158,052.35/1,380.36
  6. Step 6: Final answer
    x = 1,563.40

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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.