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Finding the Fourth Proportional to 20,384.60, 30,576.90 and 9,994.20

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Solution

The fourth proportional to 20,384.60, 30,576.90 and 9,994.20 is: 14,991.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,384.60 : 30,576.90 = 9,994.20 : x
  2. Step 2: Convert to fraction form
    20,384.60/30,576.90 = 9,994.20/x
  3. Step 3: Cross multiply
    20,384.60x = 30,576.90 × 9,994.20
  4. Step 4: Simplify right side
    20,384.60x = 305,591,653.98
  5. Step 5: Solve for x
    x = 305,591,653.98/20,384.60
  6. Step 6: Final answer
    x = 14,991.30

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Double scale
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Similar ratio
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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.