Home / 1,380.30-2,065.58-961.80

Finding the Fourth Proportional to 1,380.30, 2,065.58 and 961.80

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Solution

The fourth proportional to 1,380.30, 2,065.58 and 961.80 is: 1,439.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.30 : 2,065.58 = 961.80 : x
  2. Step 2: Convert to fraction form
    1,380.30/2,065.58 = 961.80/x
  3. Step 3: Cross multiply
    1,380.30x = 2,065.58 × 961.80
  4. Step 4: Simplify right side
    1,380.30x = 1,986,674.84
  5. Step 5: Solve for x
    x = 1,986,674.84/1,380.30
  6. Step 6: Final answer
    x = 1,439.31

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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.