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Finding the Fourth Proportional to 20,573.80, 28,395.78 and 12,077.80

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Solution

The fourth proportional to 20,573.80, 28,395.78 and 12,077.80 is: 16,669.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,573.80 : 28,395.78 = 12,077.80 : x
  2. Step 2: Convert to fraction form
    20,573.80/28,395.78 = 12,077.80/x
  3. Step 3: Cross multiply
    20,573.80x = 28,395.78 × 12,077.80
  4. Step 4: Simplify right side
    20,573.80x = 342,958,551.68
  5. Step 5: Solve for x
    x = 342,958,551.68/20,573.80
  6. Step 6: Final answer
    x = 16,669.67

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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.