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Finding the Fourth Proportional to 20,903.94, 31,349.70 and 8,420.94

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Solution

The fourth proportional to 20,903.94, 31,349.70 and 8,420.94 is: 12,628.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,903.94 : 31,349.70 = 8,420.94 : x
  2. Step 2: Convert to fraction form
    20,903.94/31,349.70 = 8,420.94/x
  3. Step 3: Cross multiply
    20,903.94x = 31,349.70 × 8,420.94
  4. Step 4: Simplify right side
    20,903.94x = 263,993,942.72
  5. Step 5: Solve for x
    x = 263,993,942.72/20,903.94
  6. Step 6: Final answer
    x = 12,628.91

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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.