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Finding the Fourth Proportional to 13,126.50, 18,122.78 and 8,419

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Solution

The fourth proportional to 13,126.50, 18,122.78 and 8,419 is: 11,623.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,126.50 : 18,122.78 = 8,419 : x
  2. Step 2: Convert to fraction form
    13,126.50/18,122.78 = 8,419/x
  3. Step 3: Cross multiply
    13,126.50x = 18,122.78 × 8,419
  4. Step 4: Simplify right side
    13,126.50x = 152,575,684.82
  5. Step 5: Solve for x
    x = 152,575,684.82/13,126.50
  6. Step 6: Final answer
    x = 11,623.49

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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.