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Finding the Fourth Proportional to 2,784.82, 3,840.90 and 1,790.20

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Solution

The fourth proportional to 2,784.82, 3,840.90 and 1,790.20 is: 2,469.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,784.82 : 3,840.90 = 1,790.20 : x
  2. Step 2: Convert to fraction form
    2,784.82/3,840.90 = 1,790.20/x
  3. Step 3: Cross multiply
    2,784.82x = 3,840.90 × 1,790.20
  4. Step 4: Simplify right side
    2,784.82x = 6,875,979.18
  5. Step 5: Solve for x
    x = 6,875,979.18/2,784.82
  6. Step 6: Final answer
    x = 2,469.09

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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.