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Finding the Fourth Proportional to 20,690.70, 30,999.60 and 16,972.80

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Solution

The fourth proportional to 20,690.70, 30,999.60 and 16,972.80 is: 25,429.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.70 : 30,999.60 = 16,972.80 : x
  2. Step 2: Convert to fraction form
    20,690.70/30,999.60 = 16,972.80/x
  3. Step 3: Cross multiply
    20,690.70x = 30,999.60 × 16,972.80
  4. Step 4: Simplify right side
    20,690.70x = 526,150,010.88
  5. Step 5: Solve for x
    x = 526,150,010.88/20,690.70
  6. Step 6: Final answer
    x = 25,429.30

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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.