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Finding the Fourth Proportional to 7,972.80, 11,959.80 and 2,129.28

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Solution

The fourth proportional to 7,972.80, 11,959.80 and 2,129.28 is: 3,194.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,972.80 : 11,959.80 = 2,129.28 : x
  2. Step 2: Convert to fraction form
    7,972.80/11,959.80 = 2,129.28/x
  3. Step 3: Cross multiply
    7,972.80x = 11,959.80 × 2,129.28
  4. Step 4: Simplify right side
    7,972.80x = 25,465,762.94
  5. Step 5: Solve for x
    x = 25,465,762.94/7,972.80
  6. Step 6: Final answer
    x = 3,194.08

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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.