Home / 13,136.27-18,128.07-8,420.56

Finding the Fourth Proportional to 13,136.27, 18,128.07 and 8,420.56

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Solution

The fourth proportional to 13,136.27, 18,128.07 and 8,420.56 is: 11,620.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,136.27 : 18,128.07 = 8,420.56 : x
  2. Step 2: Convert to fraction form
    13,136.27/18,128.07 = 8,420.56/x
  3. Step 3: Cross multiply
    13,136.27x = 18,128.07 × 8,420.56
  4. Step 4: Simplify right side
    13,136.27x = 152,648,455.80
  5. Step 5: Solve for x
    x = 152,648,455.80/13,136.27
  6. Step 6: Final answer
    x = 11,620.38

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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.