Home / 7,214.80-10,821.40-2,021.20

Finding the Fourth Proportional to 7,214.80, 10,821.40 and 2,021.20

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Solution

The fourth proportional to 7,214.80, 10,821.40 and 2,021.20 is: 3,031.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,214.80 : 10,821.40 = 2,021.20 : x
  2. Step 2: Convert to fraction form
    7,214.80/10,821.40 = 2,021.20/x
  3. Step 3: Cross multiply
    7,214.80x = 10,821.40 × 2,021.20
  4. Step 4: Simplify right side
    7,214.80x = 21,872,213.68
  5. Step 5: Solve for x
    x = 21,872,213.68/7,214.80
  6. Step 6: Final answer
    x = 3,031.58

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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.