Home / 20,803.38-28,706.40-12,305.81

Finding the Fourth Proportional to 20,803.38, 28,706.40 and 12,305.81

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Solution

The fourth proportional to 20,803.38, 28,706.40 and 12,305.81 is: 16,980.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,803.38 : 28,706.40 = 12,305.81 : x
  2. Step 2: Convert to fraction form
    20,803.38/28,706.40 = 12,305.81/x
  3. Step 3: Cross multiply
    20,803.38x = 28,706.40 × 12,305.81
  4. Step 4: Simplify right side
    20,803.38x = 353,255,360.65
  5. Step 5: Solve for x
    x = 353,255,360.65/20,803.38
  6. Step 6: Final answer
    x = 16,980.67

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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.