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Finding the Fourth Proportional to 1,916.91, 2,874.11 and 683.69

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Solution

The fourth proportional to 1,916.91, 2,874.11 and 683.69 is: 1,025.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.91 : 2,874.11 = 683.69 : x
  2. Step 2: Convert to fraction form
    1,916.91/2,874.11 = 683.69/x
  3. Step 3: Cross multiply
    1,916.91x = 2,874.11 × 683.69
  4. Step 4: Simplify right side
    1,916.91x = 1,964,982.48
  5. Step 5: Solve for x
    x = 1,964,982.48/1,916.91
  6. Step 6: Final answer
    x = 1,025.08

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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.