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Finding the Fourth Proportional to 1,986.87, 2,981.52 and 817.43

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Solution

The fourth proportional to 1,986.87, 2,981.52 and 817.43 is: 1,226.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.87 : 2,981.52 = 817.43 : x
  2. Step 2: Convert to fraction form
    1,986.87/2,981.52 = 817.43/x
  3. Step 3: Cross multiply
    1,986.87x = 2,981.52 × 817.43
  4. Step 4: Simplify right side
    1,986.87x = 2,437,168.99
  5. Step 5: Solve for x
    x = 2,437,168.99/1,986.87
  6. Step 6: Final answer
    x = 1,226.64

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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.