Home / 2,142.60-3,213.35-681.77

Finding the Fourth Proportional to 2,142.60, 3,213.35 and 681.77

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Solution

The fourth proportional to 2,142.60, 3,213.35 and 681.77 is: 1,022.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142.60 : 3,213.35 = 681.77 : x
  2. Step 2: Convert to fraction form
    2,142.60/3,213.35 = 681.77/x
  3. Step 3: Cross multiply
    2,142.60x = 3,213.35 × 681.77
  4. Step 4: Simplify right side
    2,142.60x = 2,190,765.63
  5. Step 5: Solve for x
    x = 2,190,765.63/2,142.60
  6. Step 6: Final answer
    x = 1,022.48

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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.