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Finding the Fourth Proportional to 2,872.70, 4,309.07 and 1,228.40

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Solution

The fourth proportional to 2,872.70, 4,309.07 and 1,228.40 is: 1,842.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,872.70 : 4,309.07 = 1,228.40 : x
  2. Step 2: Convert to fraction form
    2,872.70/4,309.07 = 1,228.40/x
  3. Step 3: Cross multiply
    2,872.70x = 4,309.07 × 1,228.40
  4. Step 4: Simplify right side
    2,872.70x = 5,293,233.90
  5. Step 5: Solve for x
    x = 5,293,233.90/2,872.70
  6. Step 6: Final answer
    x = 1,842.60

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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.