Home / 2,815.20-4,223.40-1,428.72

Finding the Fourth Proportional to 2,815.20, 4,223.40 and 1,428.72

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Solution

The fourth proportional to 2,815.20, 4,223.40 and 1,428.72 is: 2,143.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.20 : 4,223.40 = 1,428.72 : x
  2. Step 2: Convert to fraction form
    2,815.20/4,223.40 = 1,428.72/x
  3. Step 3: Cross multiply
    2,815.20x = 4,223.40 × 1,428.72
  4. Step 4: Simplify right side
    2,815.20x = 6,034,056.05
  5. Step 5: Solve for x
    x = 6,034,056.05/2,815.20
  6. Step 6: Final answer
    x = 2,143.38

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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.