Home / 2,127.35-3,190.20-721.40

Finding the Fourth Proportional to 2,127.35, 3,190.20 and 721.40

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Solution

The fourth proportional to 2,127.35, 3,190.20 and 721.40 is: 1,081.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,127.35 : 3,190.20 = 721.40 : x
  2. Step 2: Convert to fraction form
    2,127.35/3,190.20 = 721.40/x
  3. Step 3: Cross multiply
    2,127.35x = 3,190.20 × 721.40
  4. Step 4: Simplify right side
    2,127.35x = 2,301,391.62
  5. Step 5: Solve for x
    x = 2,301,391.62/2,127.35
  6. Step 6: Final answer
    x = 1,081.81

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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.