Home / 1,986.75-2,740.77-1,397.61

Finding the Fourth Proportional to 1,986.75, 2,740.77 and 1,397.61

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Solution

The fourth proportional to 1,986.75, 2,740.77 and 1,397.61 is: 1,928.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.75 : 2,740.77 = 1,397.61 : x
  2. Step 2: Convert to fraction form
    1,986.75/2,740.77 = 1,397.61/x
  3. Step 3: Cross multiply
    1,986.75x = 2,740.77 × 1,397.61
  4. Step 4: Simplify right side
    1,986.75x = 3,830,527.56
  5. Step 5: Solve for x
    x = 3,830,527.56/1,986.75
  6. Step 6: Final answer
    x = 1,928.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.