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Finding the Fourth Proportional to 13,818.60, 20,742.30 and 7,986.60

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Solution

The fourth proportional to 13,818.60, 20,742.30 and 7,986.60 is: 11,988.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,818.60 : 20,742.30 = 7,986.60 : x
  2. Step 2: Convert to fraction form
    13,818.60/20,742.30 = 7,986.60/x
  3. Step 3: Cross multiply
    13,818.60x = 20,742.30 × 7,986.60
  4. Step 4: Simplify right side
    13,818.60x = 165,660,453.18
  5. Step 5: Solve for x
    x = 165,660,453.18/13,818.60
  6. Step 6: Final answer
    x = 11,988.22

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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.