Home / 20,128.50-27,777.81-11,296.50

Finding the Fourth Proportional to 20,128.50, 27,777.81 and 11,296.50

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Solution

The fourth proportional to 20,128.50, 27,777.81 and 11,296.50 is: 15,589.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.50 : 27,777.81 = 11,296.50 : x
  2. Step 2: Convert to fraction form
    20,128.50/27,777.81 = 11,296.50/x
  3. Step 3: Cross multiply
    20,128.50x = 27,777.81 × 11,296.50
  4. Step 4: Simplify right side
    20,128.50x = 313,792,030.67
  5. Step 5: Solve for x
    x = 313,792,030.67/20,128.50
  6. Step 6: Final answer
    x = 15,589.44

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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.