Home / 1,986.80-2,981.71-1,431.24

Finding the Fourth Proportional to 1,986.80, 2,981.71 and 1,431.24

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Solution

The fourth proportional to 1,986.80, 2,981.71 and 1,431.24 is: 2,147.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.80 : 2,981.71 = 1,431.24 : x
  2. Step 2: Convert to fraction form
    1,986.80/2,981.71 = 1,431.24/x
  3. Step 3: Cross multiply
    1,986.80x = 2,981.71 × 1,431.24
  4. Step 4: Simplify right side
    1,986.80x = 4,267,527.71
  5. Step 5: Solve for x
    x = 4,267,527.71/1,986.80
  6. Step 6: Final answer
    x = 2,147.95

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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.