Home / 13,835.20-20,736.40-7,979.72

Finding the Fourth Proportional to 13,835.20, 20,736.40 and 7,979.72

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Solution

The fourth proportional to 13,835.20, 20,736.40 and 7,979.72 is: 11,960.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,835.20 : 20,736.40 = 7,979.72 : x
  2. Step 2: Convert to fraction form
    13,835.20/20,736.40 = 7,979.72/x
  3. Step 3: Cross multiply
    13,835.20x = 20,736.40 × 7,979.72
  4. Step 4: Simplify right side
    13,835.20x = 165,470,665.81
  5. Step 5: Solve for x
    x = 165,470,665.81/13,835.20
  6. Step 6: Final answer
    x = 11,960.12

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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.