Home / 7,680.31-11,515.37-3,000.78

Finding the Fourth Proportional to 7,680.31, 11,515.37 and 3,000.78

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Solution

The fourth proportional to 7,680.31, 11,515.37 and 3,000.78 is: 4,499.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,680.31 : 11,515.37 = 3,000.78 : x
  2. Step 2: Convert to fraction form
    7,680.31/11,515.37 = 3,000.78/x
  3. Step 3: Cross multiply
    7,680.31x = 11,515.37 × 3,000.78
  4. Step 4: Simplify right side
    7,680.31x = 34,555,076.98
  5. Step 5: Solve for x
    x = 34,555,076.98/7,680.31
  6. Step 6: Final answer
    x = 4,499.18

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1.5x scale

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.