Home / 13,136.80-18,129.22-7,168.78

Finding the Fourth Proportional to 13,136.80, 18,129.22 and 7,168.78

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Solution

The fourth proportional to 13,136.80, 18,129.22 and 7,168.78 is: 9,893.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,136.80 : 18,129.22 = 7,168.78 : x
  2. Step 2: Convert to fraction form
    13,136.80/18,129.22 = 7,168.78/x
  3. Step 3: Cross multiply
    13,136.80x = 18,129.22 × 7,168.78
  4. Step 4: Simplify right side
    13,136.80x = 129,964,389.75
  5. Step 5: Solve for x
    x = 129,964,389.75/13,136.80
  6. Step 6: Final answer
    x = 9,893.15

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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.