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Finding the Fourth Proportional to 7,978.88, 11,969.76 and 3,365.12

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Solution

The fourth proportional to 7,978.88, 11,969.76 and 3,365.12 is: 5,048.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,978.88 : 11,969.76 = 3,365.12 : x
  2. Step 2: Convert to fraction form
    7,978.88/11,969.76 = 3,365.12/x
  3. Step 3: Cross multiply
    7,978.88x = 11,969.76 × 3,365.12
  4. Step 4: Simplify right side
    7,978.88x = 40,279,678.77
  5. Step 5: Solve for x
    x = 40,279,678.77/7,978.88
  6. Step 6: Final answer
    x = 5,048.29

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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.