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Finding the Fourth Proportional to 2,779.60, 4,169.94 and 831.82

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Solution

The fourth proportional to 2,779.60, 4,169.94 and 831.82 is: 1,247.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,779.60 : 4,169.94 = 831.82 : x
  2. Step 2: Convert to fraction form
    2,779.60/4,169.94 = 831.82/x
  3. Step 3: Cross multiply
    2,779.60x = 4,169.94 × 831.82
  4. Step 4: Simplify right side
    2,779.60x = 3,468,639.49
  5. Step 5: Solve for x
    x = 3,468,639.49/2,779.60
  6. Step 6: Final answer
    x = 1,247.89

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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.