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Finding the Fourth Proportional to 2,661.95, 3,991.68 and 813.26

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Solution

The fourth proportional to 2,661.95, 3,991.68 and 813.26 is: 1,219.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.95 : 3,991.68 = 813.26 : x
  2. Step 2: Convert to fraction form
    2,661.95/3,991.68 = 813.26/x
  3. Step 3: Cross multiply
    2,661.95x = 3,991.68 × 813.26
  4. Step 4: Simplify right side
    2,661.95x = 3,246,253.72
  5. Step 5: Solve for x
    x = 3,246,253.72/2,661.95
  6. Step 6: Final answer
    x = 1,219.50

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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.