Home / 1,921.72-2,651.91-1,135.75

Finding the Fourth Proportional to 1,921.72, 2,651.91 and 1,135.75

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Solution

The fourth proportional to 1,921.72, 2,651.91 and 1,135.75 is: 1,567.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.72 : 2,651.91 = 1,135.75 : x
  2. Step 2: Convert to fraction form
    1,921.72/2,651.91 = 1,135.75/x
  3. Step 3: Cross multiply
    1,921.72x = 2,651.91 × 1,135.75
  4. Step 4: Simplify right side
    1,921.72x = 3,011,906.78
  5. Step 5: Solve for x
    x = 3,011,906.78/1,921.72
  6. Step 6: Final answer
    x = 1,567.30

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Double scale
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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.