Home / 1,420.21-2,131.58-727.35

Finding the Fourth Proportional to 1,420.21, 2,131.58 and 727.35

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Solution

The fourth proportional to 1,420.21, 2,131.58 and 727.35 is: 1,091.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.21 : 2,131.58 = 727.35 : x
  2. Step 2: Convert to fraction form
    1,420.21/2,131.58 = 727.35/x
  3. Step 3: Cross multiply
    1,420.21x = 2,131.58 × 727.35
  4. Step 4: Simplify right side
    1,420.21x = 1,550,406.53
  5. Step 5: Solve for x
    x = 1,550,406.53/1,420.21
  6. Step 6: Final answer
    x = 1,091.68

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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.