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Finding the Fourth Proportional to 13,812.67, 20,739.78 and 8,290.72

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Solution

The fourth proportional to 13,812.67, 20,739.78 and 8,290.72 is: 12,448.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,812.67 : 20,739.78 = 8,290.72 : x
  2. Step 2: Convert to fraction form
    13,812.67/20,739.78 = 8,290.72/x
  3. Step 3: Cross multiply
    13,812.67x = 20,739.78 × 8,290.72
  4. Step 4: Simplify right side
    13,812.67x = 171,947,708.84
  5. Step 5: Solve for x
    x = 171,947,708.84/13,812.67
  6. Step 6: Final answer
    x = 12,448.55

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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.