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Finding the Fourth Proportional to 7,978.80, 11,968.80 and 2,135.28

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Solution

The fourth proportional to 7,978.80, 11,968.80 and 2,135.28 is: 3,203.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,978.80 : 11,968.80 = 2,135.28 : x
  2. Step 2: Convert to fraction form
    7,978.80/11,968.80 = 2,135.28/x
  3. Step 3: Cross multiply
    7,978.80x = 11,968.80 × 2,135.28
  4. Step 4: Simplify right side
    7,978.80x = 25,556,739.26
  5. Step 5: Solve for x
    x = 25,556,739.26/7,978.80
  6. Step 6: Final answer
    x = 3,203.08

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.