Home / 20,136.78-27,788.75-11,185.11

Finding the Fourth Proportional to 20,136.78, 27,788.75 and 11,185.11

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Solution

The fourth proportional to 20,136.78, 27,788.75 and 11,185.11 is: 15,435.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,136.78 : 27,788.75 = 11,185.11 : x
  2. Step 2: Convert to fraction form
    20,136.78/27,788.75 = 11,185.11/x
  3. Step 3: Cross multiply
    20,136.78x = 27,788.75 × 11,185.11
  4. Step 4: Simplify right side
    20,136.78x = 310,820,225.51
  5. Step 5: Solve for x
    x = 310,820,225.51/20,136.78
  6. Step 6: Final answer
    x = 15,435.45

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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.