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Finding the Fourth Proportional to 7,790.90, 11,687.90 and 2,860.59

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Solution

The fourth proportional to 7,790.90, 11,687.90 and 2,860.59 is: 4,291.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,790.90 : 11,687.90 = 2,860.59 : x
  2. Step 2: Convert to fraction form
    7,790.90/11,687.90 = 2,860.59/x
  3. Step 3: Cross multiply
    7,790.90x = 11,687.90 × 2,860.59
  4. Step 4: Simplify right side
    7,790.90x = 33,434,275.56
  5. Step 5: Solve for x
    x = 33,434,275.56/7,790.90
  6. Step 6: Final answer
    x = 4,291.46

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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.