Home / 2,121.04-3,180.48-1,428.76

Finding the Fourth Proportional to 2,121.04, 3,180.48 and 1,428.76

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Solution

The fourth proportional to 2,121.04, 3,180.48 and 1,428.76 is: 2,142.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.04 : 3,180.48 = 1,428.76 : x
  2. Step 2: Convert to fraction form
    2,121.04/3,180.48 = 1,428.76/x
  3. Step 3: Cross multiply
    2,121.04x = 3,180.48 × 1,428.76
  4. Step 4: Simplify right side
    2,121.04x = 4,544,142.60
  5. Step 5: Solve for x
    x = 4,544,142.60/2,121.04
  6. Step 6: Final answer
    x = 2,142.41

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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.