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Finding the Fourth Proportional to 6,368.90, 8,789.11 and 3,679.90

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Solution

The fourth proportional to 6,368.90, 8,789.11 and 3,679.90 is: 5,078.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,368.90 : 8,789.11 = 3,679.90 : x
  2. Step 2: Convert to fraction form
    6,368.90/8,789.11 = 3,679.90/x
  3. Step 3: Cross multiply
    6,368.90x = 8,789.11 × 3,679.90
  4. Step 4: Simplify right side
    6,368.90x = 32,343,014.72
  5. Step 5: Solve for x
    x = 32,343,014.72/6,368.90
  6. Step 6: Final answer
    x = 5,078.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.