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Finding the Fourth Proportional to 2,812.65, 4,218.95 and 838.26

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Solution

The fourth proportional to 2,812.65, 4,218.95 and 838.26 is: 1,257.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,812.65 : 4,218.95 = 838.26 : x
  2. Step 2: Convert to fraction form
    2,812.65/4,218.95 = 838.26/x
  3. Step 3: Cross multiply
    2,812.65x = 4,218.95 × 838.26
  4. Step 4: Simplify right side
    2,812.65x = 3,536,579.12
  5. Step 5: Solve for x
    x = 3,536,579.12/2,812.65
  6. Step 6: Final answer
    x = 1,257.38

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1.5x scale

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.