Home / 7,961.80-11,931.90-5,321.80

Finding the Fourth Proportional to 7,961.80, 11,931.90 and 5,321.80

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Solution

The fourth proportional to 7,961.80, 11,931.90 and 5,321.80 is: 7,975.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,961.80 : 11,931.90 = 5,321.80 : x
  2. Step 2: Convert to fraction form
    7,961.80/11,931.90 = 5,321.80/x
  3. Step 3: Cross multiply
    7,961.80x = 11,931.90 × 5,321.80
  4. Step 4: Simplify right side
    7,961.80x = 63,499,185.42
  5. Step 5: Solve for x
    x = 63,499,185.42/7,961.80
  6. Step 6: Final answer
    x = 7,975.48

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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.