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Finding the Fourth Proportional to 13,613.12, 18,777.12 and 8,901.44

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Solution

The fourth proportional to 13,613.12, 18,777.12 and 8,901.44 is: 12,278.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,613.12 : 18,777.12 = 8,901.44 : x
  2. Step 2: Convert to fraction form
    13,613.12/18,777.12 = 8,901.44/x
  3. Step 3: Cross multiply
    13,613.12x = 18,777.12 × 8,901.44
  4. Step 4: Simplify right side
    13,613.12x = 167,143,407.05
  5. Step 5: Solve for x
    x = 167,143,407.05/13,613.12
  6. Step 6: Final answer
    x = 12,278.11

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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.