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Finding the Fourth Proportional to 13,978.40, 20,961.11 and 5,210.96

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Solution

The fourth proportional to 13,978.40, 20,961.11 and 5,210.96 is: 7,814.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,978.40 : 20,961.11 = 5,210.96 : x
  2. Step 2: Convert to fraction form
    13,978.40/20,961.11 = 5,210.96/x
  3. Step 3: Cross multiply
    13,978.40x = 20,961.11 × 5,210.96
  4. Step 4: Simplify right side
    13,978.40x = 109,227,413.99
  5. Step 5: Solve for x
    x = 109,227,413.99/13,978.40
  6. Step 6: Final answer
    x = 7,814.02

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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.