Home / 20,278.92-27,980.12-12,320.67

Finding the Fourth Proportional to 20,278.92, 27,980.12 and 12,320.67

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Solution

The fourth proportional to 20,278.92, 27,980.12 and 12,320.67 is: 16,999.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,278.92 : 27,980.12 = 12,320.67 : x
  2. Step 2: Convert to fraction form
    20,278.92/27,980.12 = 12,320.67/x
  3. Step 3: Cross multiply
    20,278.92x = 27,980.12 × 12,320.67
  4. Step 4: Simplify right side
    20,278.92x = 344,733,763.48
  5. Step 5: Solve for x
    x = 344,733,763.48/20,278.92
  6. Step 6: Final answer
    x = 16,999.61

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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.