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Finding the Fourth Proportional to 2,072.51, 3,109.34 and 840.78

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Solution

The fourth proportional to 2,072.51, 3,109.34 and 840.78 is: 1,261.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,072.51 : 3,109.34 = 840.78 : x
  2. Step 2: Convert to fraction form
    2,072.51/3,109.34 = 840.78/x
  3. Step 3: Cross multiply
    2,072.51x = 3,109.34 × 840.78
  4. Step 4: Simplify right side
    2,072.51x = 2,614,266.68
  5. Step 5: Solve for x
    x = 2,614,266.68/2,072.51
  6. Step 6: Final answer
    x = 1,261.40

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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.