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Finding the Fourth Proportional to 12,991.51, 17,928.34 and 8,213.55

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Solution

The fourth proportional to 12,991.51, 17,928.34 and 8,213.55 is: 11,334.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.51 : 17,928.34 = 8,213.55 : x
  2. Step 2: Convert to fraction form
    12,991.51/17,928.34 = 8,213.55/x
  3. Step 3: Cross multiply
    12,991.51x = 17,928.34 × 8,213.55
  4. Step 4: Simplify right side
    12,991.51x = 147,255,317.01
  5. Step 5: Solve for x
    x = 147,255,317.01/12,991.51
  6. Step 6: Final answer
    x = 11,334.73

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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.