Home / 2,146.40-3,220.10-685.55

Finding the Fourth Proportional to 2,146.40, 3,220.10 and 685.55

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Solution

The fourth proportional to 2,146.40, 3,220.10 and 685.55 is: 1,028.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,146.40 : 3,220.10 = 685.55 : x
  2. Step 2: Convert to fraction form
    2,146.40/3,220.10 = 685.55/x
  3. Step 3: Cross multiply
    2,146.40x = 3,220.10 × 685.55
  4. Step 4: Simplify right side
    2,146.40x = 2,207,539.56
  5. Step 5: Solve for x
    x = 2,207,539.56/2,146.40
  6. Step 6: Final answer
    x = 1,028.48

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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.