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Finding the Fourth Proportional to 13,993.79, 19,311.90 and 7,620.49

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Solution

The fourth proportional to 13,993.79, 19,311.90 and 7,620.49 is: 10,516.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,993.79 : 19,311.90 = 7,620.49 : x
  2. Step 2: Convert to fraction form
    13,993.79/19,311.90 = 7,620.49/x
  3. Step 3: Cross multiply
    13,993.79x = 19,311.90 × 7,620.49
  4. Step 4: Simplify right side
    13,993.79x = 147,166,124.94
  5. Step 5: Solve for x
    x = 147,166,124.94/13,993.79
  6. Step 6: Final answer
    x = 10,516.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.