Home / 7,128.78-10,685.20-2,965.95

Finding the Fourth Proportional to 7,128.78, 10,685.20 and 2,965.95

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Solution

The fourth proportional to 7,128.78, 10,685.20 and 2,965.95 is: 4,445.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128.78 : 10,685.20 = 2,965.95 : x
  2. Step 2: Convert to fraction form
    7,128.78/10,685.20 = 2,965.95/x
  3. Step 3: Cross multiply
    7,128.78x = 10,685.20 × 2,965.95
  4. Step 4: Simplify right side
    7,128.78x = 31,691,768.94
  5. Step 5: Solve for x
    x = 31,691,768.94/7,128.78
  6. Step 6: Final answer
    x = 4,445.61

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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.