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Finding the Fourth Proportional to 1,986.87, 2,981.12 and 890.94

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Solution

The fourth proportional to 1,986.87, 2,981.12 and 890.94 is: 1,336.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.87 : 2,981.12 = 890.94 : x
  2. Step 2: Convert to fraction form
    1,986.87/2,981.12 = 890.94/x
  3. Step 3: Cross multiply
    1,986.87x = 2,981.12 × 890.94
  4. Step 4: Simplify right side
    1,986.87x = 2,655,994.60
  5. Step 5: Solve for x
    x = 2,655,994.60/1,986.87
  6. Step 6: Final answer
    x = 1,336.77

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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.