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Finding the Fourth Proportional to 2,112.16, 3,169.38 and 813.64

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Solution

The fourth proportional to 2,112.16, 3,169.38 and 813.64 is: 1,220.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,112.16 : 3,169.38 = 813.64 : x
  2. Step 2: Convert to fraction form
    2,112.16/3,169.38 = 813.64/x
  3. Step 3: Cross multiply
    2,112.16x = 3,169.38 × 813.64
  4. Step 4: Simplify right side
    2,112.16x = 2,578,734.34
  5. Step 5: Solve for x
    x = 2,578,734.34/2,112.16
  6. Step 6: Final answer
    x = 1,220.90

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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.