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Finding the Fourth Proportional to 2,586.81, 3,879.65 and 831.35

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Solution

The fourth proportional to 2,586.81, 3,879.65 and 831.35 is: 1,246.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,586.81 : 3,879.65 = 831.35 : x
  2. Step 2: Convert to fraction form
    2,586.81/3,879.65 = 831.35/x
  3. Step 3: Cross multiply
    2,586.81x = 3,879.65 × 831.35
  4. Step 4: Simplify right side
    2,586.81x = 3,225,323.47
  5. Step 5: Solve for x
    x = 3,225,323.47/2,586.81
  6. Step 6: Final answer
    x = 1,246.83

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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.