Home / 7,909.12-10,921.60-5,121.28

Finding the Fourth Proportional to 7,909.12, 10,921.60 and 5,121.28

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Solution

The fourth proportional to 7,909.12, 10,921.60 and 5,121.28 is: 7,071.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,909.12 : 10,921.60 = 5,121.28 : x
  2. Step 2: Convert to fraction form
    7,909.12/10,921.60 = 5,121.28/x
  3. Step 3: Cross multiply
    7,909.12x = 10,921.60 × 5,121.28
  4. Step 4: Simplify right side
    7,909.12x = 55,932,571.65
  5. Step 5: Solve for x
    x = 55,932,571.65/7,909.12
  6. Step 6: Final answer
    x = 7,071.91

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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.