Home / 3,990.80-5,986.15-1,217.45

Finding the Fourth Proportional to 3,990.80, 5,986.15 and 1,217.45

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Solution

The fourth proportional to 3,990.80, 5,986.15 and 1,217.45 is: 1,826.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.80 : 5,986.15 = 1,217.45 : x
  2. Step 2: Convert to fraction form
    3,990.80/5,986.15 = 1,217.45/x
  3. Step 3: Cross multiply
    3,990.80x = 5,986.15 × 1,217.45
  4. Step 4: Simplify right side
    3,990.80x = 7,287,838.32
  5. Step 5: Solve for x
    x = 7,287,838.32/3,990.80
  6. Step 6: Final answer
    x = 1,826.16

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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.