Home / 13,141.92-18,136.32-7,840.80

Finding the Fourth Proportional to 13,141.92, 18,136.32 and 7,840.80

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Solution

The fourth proportional to 13,141.92, 18,136.32 and 7,840.80 is: 10,820.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,141.92 : 18,136.32 = 7,840.80 : x
  2. Step 2: Convert to fraction form
    13,141.92/18,136.32 = 7,840.80/x
  3. Step 3: Cross multiply
    13,141.92x = 18,136.32 × 7,840.80
  4. Step 4: Simplify right side
    13,141.92x = 142,203,257.86
  5. Step 5: Solve for x
    x = 142,203,257.86/13,141.92
  6. Step 6: Final answer
    x = 10,820.58

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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.