Home / 1,420.35-2,131.81-727.49

Finding the Fourth Proportional to 1,420.35, 2,131.81 and 727.49

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Solution

The fourth proportional to 1,420.35, 2,131.81 and 727.49 is: 1,091.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.35 : 2,131.81 = 727.49 : x
  2. Step 2: Convert to fraction form
    1,420.35/2,131.81 = 727.49/x
  3. Step 3: Cross multiply
    1,420.35x = 2,131.81 × 727.49
  4. Step 4: Simplify right side
    1,420.35x = 1,550,873.97
  5. Step 5: Solve for x
    x = 1,550,873.97/1,420.35
  6. Step 6: Final answer
    x = 1,091.90

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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.