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Finding the Fourth Proportional to 2,612.78, 3,919.20 and 763.91

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Solution

The fourth proportional to 2,612.78, 3,919.20 and 763.91 is: 1,145.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,612.78 : 3,919.20 = 763.91 : x
  2. Step 2: Convert to fraction form
    2,612.78/3,919.20 = 763.91/x
  3. Step 3: Cross multiply
    2,612.78x = 3,919.20 × 763.91
  4. Step 4: Simplify right side
    2,612.78x = 2,993,916.07
  5. Step 5: Solve for x
    x = 2,993,916.07/2,612.78
  6. Step 6: Final answer
    x = 1,145.87

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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.