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Finding the Fourth Proportional to 1,986.84, 2,981.70 and 891.90

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Solution

The fourth proportional to 1,986.84, 2,981.70 and 891.90 is: 1,338.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.84 : 2,981.70 = 891.90 : x
  2. Step 2: Convert to fraction form
    1,986.84/2,981.70 = 891.90/x
  3. Step 3: Cross multiply
    1,986.84x = 2,981.70 × 891.90
  4. Step 4: Simplify right side
    1,986.84x = 2,659,378.23
  5. Step 5: Solve for x
    x = 2,659,378.23/1,986.84
  6. Step 6: Final answer
    x = 1,338.50

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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.