Home / 13,705.58-18,912.75-8,115.50

Finding the Fourth Proportional to 13,705.58, 18,912.75 and 8,115.50

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Solution

The fourth proportional to 13,705.58, 18,912.75 and 8,115.50 is: 11,198.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,705.58 : 18,912.75 = 8,115.50 : x
  2. Step 2: Convert to fraction form
    13,705.58/18,912.75 = 8,115.50/x
  3. Step 3: Cross multiply
    13,705.58x = 18,912.75 × 8,115.50
  4. Step 4: Simplify right side
    13,705.58x = 153,486,422.63
  5. Step 5: Solve for x
    x = 153,486,422.63/13,705.58
  6. Step 6: Final answer
    x = 11,198.83

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1.5x scale

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.