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Finding the Fourth Proportional to 2,586.36, 3,879.56 and 638.56

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Solution

The fourth proportional to 2,586.36, 3,879.56 and 638.56 is: 957.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,586.36 : 3,879.56 = 638.56 : x
  2. Step 2: Convert to fraction form
    2,586.36/3,879.56 = 638.56/x
  3. Step 3: Cross multiply
    2,586.36x = 3,879.56 × 638.56
  4. Step 4: Simplify right side
    2,586.36x = 2,477,331.83
  5. Step 5: Solve for x
    x = 2,477,331.83/2,586.36
  6. Step 6: Final answer
    x = 957.84

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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.