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Finding the Fourth Proportional to 12,616.40, 18,908.40 and 11,223.20

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Solution

The fourth proportional to 12,616.40, 18,908.40 and 11,223.20 is: 16,820.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,616.40 : 18,908.40 = 11,223.20 : x
  2. Step 2: Convert to fraction form
    12,616.40/18,908.40 = 11,223.20/x
  3. Step 3: Cross multiply
    12,616.40x = 18,908.40 × 11,223.20
  4. Step 4: Simplify right side
    12,616.40x = 212,212,754.88
  5. Step 5: Solve for x
    x = 212,212,754.88/12,616.40
  6. Step 6: Final answer
    x = 16,820.39

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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.