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Finding the Fourth Proportional to 2,586.49, 3,879.69 and 638.71

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Solution

The fourth proportional to 2,586.49, 3,879.69 and 638.71 is: 958.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,586.49 : 3,879.69 = 638.71 : x
  2. Step 2: Convert to fraction form
    2,586.49/3,879.69 = 638.71/x
  3. Step 3: Cross multiply
    2,586.49x = 3,879.69 × 638.71
  4. Step 4: Simplify right side
    2,586.49x = 2,477,996.80
  5. Step 5: Solve for x
    x = 2,477,996.80/2,586.49
  6. Step 6: Final answer
    x = 958.05

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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.