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Finding the Fourth Proportional to 1,912.13, 2,868.50 and 816.50

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Solution

The fourth proportional to 1,912.13, 2,868.50 and 816.50 is: 1,224.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.13 : 2,868.50 = 816.50 : x
  2. Step 2: Convert to fraction form
    1,912.13/2,868.50 = 816.50/x
  3. Step 3: Cross multiply
    1,912.13x = 2,868.50 × 816.50
  4. Step 4: Simplify right side
    1,912.13x = 2,342,130.25
  5. Step 5: Solve for x
    x = 2,342,130.25/1,912.13
  6. Step 6: Final answer
    x = 1,224.88

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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.