Home / 13,128.65-18,120.46-8,347.67

Finding the Fourth Proportional to 13,128.65, 18,120.46 and 8,347.67

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Solution

The fourth proportional to 13,128.65, 18,120.46 and 8,347.67 is: 11,521.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.65 : 18,120.46 = 8,347.67 : x
  2. Step 2: Convert to fraction form
    13,128.65/18,120.46 = 8,347.67/x
  3. Step 3: Cross multiply
    13,128.65x = 18,120.46 × 8,347.67
  4. Step 4: Simplify right side
    13,128.65x = 151,263,529.73
  5. Step 5: Solve for x
    x = 151,263,529.73/13,128.65
  6. Step 6: Final answer
    x = 11,521.64

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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.