Home / 13,136.33-18,128.12-8,420.61

Finding the Fourth Proportional to 13,136.33, 18,128.12 and 8,420.61

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Solution

The fourth proportional to 13,136.33, 18,128.12 and 8,420.61 is: 11,620.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,136.33 : 18,128.12 = 8,420.61 : x
  2. Step 2: Convert to fraction form
    13,136.33/18,128.12 = 8,420.61/x
  3. Step 3: Cross multiply
    13,136.33x = 18,128.12 × 8,420.61
  4. Step 4: Simplify right side
    13,136.33x = 152,649,786.45
  5. Step 5: Solve for x
    x = 152,649,786.45/13,136.33
  6. Step 6: Final answer
    x = 11,620.43

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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.