Home / 20,955.81-28,918.53-11,395.56

Finding the Fourth Proportional to 20,955.81, 28,918.53 and 11,395.56

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Solution

The fourth proportional to 20,955.81, 28,918.53 and 11,395.56 is: 15,725.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,955.81 : 28,918.53 = 11,395.56 : x
  2. Step 2: Convert to fraction form
    20,955.81/28,918.53 = 11,395.56/x
  3. Step 3: Cross multiply
    20,955.81x = 28,918.53 × 11,395.56
  4. Step 4: Simplify right side
    20,955.81x = 329,542,843.73
  5. Step 5: Solve for x
    x = 329,542,843.73/20,955.81
  6. Step 6: Final answer
    x = 15,725.61

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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.