Home / 13,136.69-18,128.75-7,168.39

Finding the Fourth Proportional to 13,136.69, 18,128.75 and 7,168.39

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Solution

The fourth proportional to 13,136.69, 18,128.75 and 7,168.39 is: 9,892.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,136.69 : 18,128.75 = 7,168.39 : x
  2. Step 2: Convert to fraction form
    13,136.69/18,128.75 = 7,168.39/x
  3. Step 3: Cross multiply
    13,136.69x = 18,128.75 × 7,168.39
  4. Step 4: Simplify right side
    13,136.69x = 129,953,950.21
  5. Step 5: Solve for x
    x = 129,953,950.21/13,136.69
  6. Step 6: Final answer
    x = 9,892.44

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Half scale
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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.