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Finding the Fourth Proportional to 1,916.66, 2,645.66 and 1,208.99

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Solution

The fourth proportional to 1,916.66, 2,645.66 and 1,208.99 is: 1,668.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.66 : 2,645.66 = 1,208.99 : x
  2. Step 2: Convert to fraction form
    1,916.66/2,645.66 = 1,208.99/x
  3. Step 3: Cross multiply
    1,916.66x = 2,645.66 × 1,208.99
  4. Step 4: Simplify right side
    1,916.66x = 3,198,576.48
  5. Step 5: Solve for x
    x = 3,198,576.48/1,916.66
  6. Step 6: Final answer
    x = 1,668.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.