Home / 20,371.99-28,112.81-11,420.07

Finding the Fourth Proportional to 20,371.99, 28,112.81 and 11,420.07

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Solution

The fourth proportional to 20,371.99, 28,112.81 and 11,420.07 is: 15,759.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,371.99 : 28,112.81 = 11,420.07 : x
  2. Step 2: Convert to fraction form
    20,371.99/28,112.81 = 11,420.07/x
  3. Step 3: Cross multiply
    20,371.99x = 28,112.81 × 11,420.07
  4. Step 4: Simplify right side
    20,371.99x = 321,050,201.00
  5. Step 5: Solve for x
    x = 321,050,201.00/20,371.99
  6. Step 6: Final answer
    x = 15,759.40

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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.