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Finding the Fourth Proportional to 13,659.22, 18,842.59 and 8,621.63

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Solution

The fourth proportional to 13,659.22, 18,842.59 and 8,621.63 is: 11,893.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,659.22 : 18,842.59 = 8,621.63 : x
  2. Step 2: Convert to fraction form
    13,659.22/18,842.59 = 8,621.63/x
  3. Step 3: Cross multiply
    13,659.22x = 18,842.59 × 8,621.63
  4. Step 4: Simplify right side
    13,659.22x = 162,453,839.22
  5. Step 5: Solve for x
    x = 162,453,839.22/13,659.22
  6. Step 6: Final answer
    x = 11,893.35

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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.