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Finding the Fourth Proportional to 20,847.70, 28,768 and 12,348.32

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Solution

The fourth proportional to 20,847.70, 28,768 and 12,348.32 is: 17,039.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,847.70 : 28,768 = 12,348.32 : x
  2. Step 2: Convert to fraction form
    20,847.70/28,768 = 12,348.32/x
  3. Step 3: Cross multiply
    20,847.70x = 28,768 × 12,348.32
  4. Step 4: Simplify right side
    20,847.70x = 355,236,469.76
  5. Step 5: Solve for x
    x = 355,236,469.76/20,847.70
  6. Step 6: Final answer
    x = 17,039.60

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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.