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Finding the Fourth Proportional to 20,245.60, 30,368.78 and 6,921.64

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Solution

The fourth proportional to 20,245.60, 30,368.78 and 6,921.64 is: 10,382.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,245.60 : 30,368.78 = 6,921.64 : x
  2. Step 2: Convert to fraction form
    20,245.60/30,368.78 = 6,921.64/x
  3. Step 3: Cross multiply
    20,245.60x = 30,368.78 × 6,921.64
  4. Step 4: Simplify right side
    20,245.60x = 210,201,762.40
  5. Step 5: Solve for x
    x = 210,201,762.40/20,245.60
  6. Step 6: Final answer
    x = 10,382.59

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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.