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Finding the Fourth Proportional to 2,074.05, 3,111.08 and 840.65

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Solution

The fourth proportional to 2,074.05, 3,111.08 and 840.65 is: 1,260.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,074.05 : 3,111.08 = 840.65 : x
  2. Step 2: Convert to fraction form
    2,074.05/3,111.08 = 840.65/x
  3. Step 3: Cross multiply
    2,074.05x = 3,111.08 × 840.65
  4. Step 4: Simplify right side
    2,074.05x = 2,615,309.64
  5. Step 5: Solve for x
    x = 2,615,309.64/2,074.05
  6. Step 6: Final answer
    x = 1,260.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.