Home / 9,378.75-12,942.19-5,128.98

Finding the Fourth Proportional to 9,378.75, 12,942.19 and 5,128.98

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Solution

The fourth proportional to 9,378.75, 12,942.19 and 5,128.98 is: 7,077.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,378.75 : 12,942.19 = 5,128.98 : x
  2. Step 2: Convert to fraction form
    9,378.75/12,942.19 = 5,128.98/x
  3. Step 3: Cross multiply
    9,378.75x = 12,942.19 × 5,128.98
  4. Step 4: Simplify right side
    9,378.75x = 66,380,208.02
  5. Step 5: Solve for x
    x = 66,380,208.02/9,378.75
  6. Step 6: Final answer
    x = 7,077.73

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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.