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Finding the Fourth Proportional to 2,891.36, 3,990.72 and 2,260.64

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Solution

The fourth proportional to 2,891.36, 3,990.72 and 2,260.64 is: 3,120.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891.36 : 3,990.72 = 2,260.64 : x
  2. Step 2: Convert to fraction form
    2,891.36/3,990.72 = 2,260.64/x
  3. Step 3: Cross multiply
    2,891.36x = 3,990.72 × 2,260.64
  4. Step 4: Simplify right side
    2,891.36x = 9,021,581.26
  5. Step 5: Solve for x
    x = 9,021,581.26/2,891.36
  6. Step 6: Final answer
    x = 3,120.19

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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.