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Finding the Fourth Proportional to 13,653.44, 18,847.68 and 8,685.44

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Solution

The fourth proportional to 13,653.44, 18,847.68 and 8,685.44 is: 11,989.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,653.44 : 18,847.68 = 8,685.44 : x
  2. Step 2: Convert to fraction form
    13,653.44/18,847.68 = 8,685.44/x
  3. Step 3: Cross multiply
    13,653.44x = 18,847.68 × 8,685.44
  4. Step 4: Simplify right side
    13,653.44x = 163,700,393.78
  5. Step 5: Solve for x
    x = 163,700,393.78/13,653.44
  6. Step 6: Final answer
    x = 11,989.68

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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.