Home / 7,128.45-9,839.16-4,103.91

Finding the Fourth Proportional to 7,128.45, 9,839.16 and 4,103.91

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Solution

The fourth proportional to 7,128.45, 9,839.16 and 4,103.91 is: 5,664.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128.45 : 9,839.16 = 4,103.91 : x
  2. Step 2: Convert to fraction form
    7,128.45/9,839.16 = 4,103.91/x
  3. Step 3: Cross multiply
    7,128.45x = 9,839.16 × 4,103.91
  4. Step 4: Simplify right side
    7,128.45x = 40,379,027.12
  5. Step 5: Solve for x
    x = 40,379,027.12/7,128.45
  6. Step 6: Final answer
    x = 5,664.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.