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Finding the Fourth Proportional to 12,638.21, 18,941.94 and 8,941.51

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Solution

The fourth proportional to 12,638.21, 18,941.94 and 8,941.51 is: 13,401.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,638.21 : 18,941.94 = 8,941.51 : x
  2. Step 2: Convert to fraction form
    12,638.21/18,941.94 = 8,941.51/x
  3. Step 3: Cross multiply
    12,638.21x = 18,941.94 × 8,941.51
  4. Step 4: Simplify right side
    12,638.21x = 169,369,451.22
  5. Step 5: Solve for x
    x = 169,369,451.22/12,638.21
  6. Step 6: Final answer
    x = 13,401.38

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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.