Home / 1,420.45-2,131.77-727.06

Finding the Fourth Proportional to 1,420.45, 2,131.77 and 727.06

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Solution

The fourth proportional to 1,420.45, 2,131.77 and 727.06 is: 1,091.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.45 : 2,131.77 = 727.06 : x
  2. Step 2: Convert to fraction form
    1,420.45/2,131.77 = 727.06/x
  3. Step 3: Cross multiply
    1,420.45x = 2,131.77 × 727.06
  4. Step 4: Simplify right side
    1,420.45x = 1,549,924.70
  5. Step 5: Solve for x
    x = 1,549,924.70/1,420.45
  6. Step 6: Final answer
    x = 1,091.15

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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.