Home / 13,136.69-18,128.63-8,420.99

Finding the Fourth Proportional to 13,136.69, 18,128.63 and 8,420.99

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Solution

The fourth proportional to 13,136.69, 18,128.63 and 8,420.99 is: 11,620.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,136.69 : 18,128.63 = 8,420.99 : x
  2. Step 2: Convert to fraction form
    13,136.69/18,128.63 = 8,420.99/x
  3. Step 3: Cross multiply
    13,136.69x = 18,128.63 × 8,420.99
  4. Step 4: Simplify right side
    13,136.69x = 152,660,942.35
  5. Step 5: Solve for x
    x = 152,660,942.35/13,136.69
  6. Step 6: Final answer
    x = 11,620.96

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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.