Home / 3,431.80-5,145.90-1,240.20

Finding the Fourth Proportional to 3,431.80, 5,145.90 and 1,240.20

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Solution

The fourth proportional to 3,431.80, 5,145.90 and 1,240.20 is: 1,859.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,431.80 : 5,145.90 = 1,240.20 : x
  2. Step 2: Convert to fraction form
    3,431.80/5,145.90 = 1,240.20/x
  3. Step 3: Cross multiply
    3,431.80x = 5,145.90 × 1,240.20
  4. Step 4: Simplify right side
    3,431.80x = 6,381,945.18
  5. Step 5: Solve for x
    x = 6,381,945.18/3,431.80
  6. Step 6: Final answer
    x = 1,859.65

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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.