Home / 2,781.81-4,172.76-1,321.11

Finding the Fourth Proportional to 2,781.81, 4,172.76 and 1,321.11

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Solution

The fourth proportional to 2,781.81, 4,172.76 and 1,321.11 is: 1,981.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,781.81 : 4,172.76 = 1,321.11 : x
  2. Step 2: Convert to fraction form
    2,781.81/4,172.76 = 1,321.11/x
  3. Step 3: Cross multiply
    2,781.81x = 4,172.76 × 1,321.11
  4. Step 4: Simplify right side
    2,781.81x = 5,512,674.96
  5. Step 5: Solve for x
    x = 5,512,674.96/2,781.81
  6. Step 6: Final answer
    x = 1,981.69

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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.