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Finding the Fourth Proportional to 13,959.65, 20,942.90 and 6,942.98

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Solution

The fourth proportional to 13,959.65, 20,942.90 and 6,942.98 is: 10,416.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,959.65 : 20,942.90 = 6,942.98 : x
  2. Step 2: Convert to fraction form
    13,959.65/20,942.90 = 6,942.98/x
  3. Step 3: Cross multiply
    13,959.65x = 20,942.90 × 6,942.98
  4. Step 4: Simplify right side
    13,959.65x = 145,405,996.41
  5. Step 5: Solve for x
    x = 145,405,996.41/13,959.65
  6. Step 6: Final answer
    x = 10,416.17

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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.