Home / 13,639.12-20,437.70-8,081.40

Finding the Fourth Proportional to 13,639.12, 20,437.70 and 8,081.40

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Solution

The fourth proportional to 13,639.12, 20,437.70 and 8,081.40 is: 12,109.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,639.12 : 20,437.70 = 8,081.40 : x
  2. Step 2: Convert to fraction form
    13,639.12/20,437.70 = 8,081.40/x
  3. Step 3: Cross multiply
    13,639.12x = 20,437.70 × 8,081.40
  4. Step 4: Simplify right side
    13,639.12x = 165,165,228.78
  5. Step 5: Solve for x
    x = 165,165,228.78/13,639.12
  6. Step 6: Final answer
    x = 12,109.67

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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.