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Finding the Fourth Proportional to 2,612.91, 3,919.41 and 638.54

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Solution

The fourth proportional to 2,612.91, 3,919.41 and 638.54 is: 957.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,612.91 : 3,919.41 = 638.54 : x
  2. Step 2: Convert to fraction form
    2,612.91/3,919.41 = 638.54/x
  3. Step 3: Cross multiply
    2,612.91x = 3,919.41 × 638.54
  4. Step 4: Simplify right side
    2,612.91x = 2,502,707.98
  5. Step 5: Solve for x
    x = 2,502,707.98/2,612.91
  6. Step 6: Final answer
    x = 957.82

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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.