Home / 8,619.90-12,930.21-5,149.50

Finding the Fourth Proportional to 8,619.90, 12,930.21 and 5,149.50

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Solution

The fourth proportional to 8,619.90, 12,930.21 and 5,149.50 is: 7,724.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,619.90 : 12,930.21 = 5,149.50 : x
  2. Step 2: Convert to fraction form
    8,619.90/12,930.21 = 5,149.50/x
  3. Step 3: Cross multiply
    8,619.90x = 12,930.21 × 5,149.50
  4. Step 4: Simplify right side
    8,619.90x = 66,584,116.40
  5. Step 5: Solve for x
    x = 66,584,116.40/8,619.90
  6. Step 6: Final answer
    x = 7,724.47

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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.