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Finding the Fourth Proportional to 20,596.60, 30,894.90 and 12,820.60

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Solution

The fourth proportional to 20,596.60, 30,894.90 and 12,820.60 is: 19,230.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,596.60 : 30,894.90 = 12,820.60 : x
  2. Step 2: Convert to fraction form
    20,596.60/30,894.90 = 12,820.60/x
  3. Step 3: Cross multiply
    20,596.60x = 30,894.90 × 12,820.60
  4. Step 4: Simplify right side
    20,596.60x = 396,091,154.94
  5. Step 5: Solve for x
    x = 396,091,154.94/20,596.60
  6. Step 6: Final answer
    x = 19,230.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.