Home / 6,921.40-10,383.69-1,991.08

Finding the Fourth Proportional to 6,921.40, 10,383.69 and 1,991.08

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Solution

The fourth proportional to 6,921.40, 10,383.69 and 1,991.08 is: 2,987.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,921.40 : 10,383.69 = 1,991.08 : x
  2. Step 2: Convert to fraction form
    6,921.40/10,383.69 = 1,991.08/x
  3. Step 3: Cross multiply
    6,921.40x = 10,383.69 × 1,991.08
  4. Step 4: Simplify right side
    6,921.40x = 20,674,757.49
  5. Step 5: Solve for x
    x = 20,674,757.49/6,921.40
  6. Step 6: Final answer
    x = 2,987.08

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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.