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Finding the Fourth Proportional to 2,858.08, 3,940.24 and 1,913.92

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Solution

The fourth proportional to 2,858.08, 3,940.24 and 1,913.92 is: 2,638.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,858.08 : 3,940.24 = 1,913.92 : x
  2. Step 2: Convert to fraction form
    2,858.08/3,940.24 = 1,913.92/x
  3. Step 3: Cross multiply
    2,858.08x = 3,940.24 × 1,913.92
  4. Step 4: Simplify right side
    2,858.08x = 7,541,304.14
  5. Step 5: Solve for x
    x = 7,541,304.14/2,858.08
  6. Step 6: Final answer
    x = 2,638.59

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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.