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Finding the Fourth Proportional to 2,112.90, 3,169.39 and 652.05

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Solution

The fourth proportional to 2,112.90, 3,169.39 and 652.05 is: 978.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,112.90 : 3,169.39 = 652.05 : x
  2. Step 2: Convert to fraction form
    2,112.90/3,169.39 = 652.05/x
  3. Step 3: Cross multiply
    2,112.90x = 3,169.39 × 652.05
  4. Step 4: Simplify right side
    2,112.90x = 2,066,600.75
  5. Step 5: Solve for x
    x = 2,066,600.75/2,112.90
  6. Step 6: Final answer
    x = 978.09

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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.