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Finding the Fourth Proportional to 5,317.85, 7,978.91 and 2,651.54

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Solution

The fourth proportional to 5,317.85, 7,978.91 and 2,651.54 is: 3,978.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,317.85 : 7,978.91 = 2,651.54 : x
  2. Step 2: Convert to fraction form
    5,317.85/7,978.91 = 2,651.54/x
  3. Step 3: Cross multiply
    5,317.85x = 7,978.91 × 2,651.54
  4. Step 4: Simplify right side
    5,317.85x = 21,156,345.87
  5. Step 5: Solve for x
    x = 21,156,345.87/5,317.85
  6. Step 6: Final answer
    x = 3,978.36

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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.