Home / 20,507.81-28,300.41-11,555.10

Finding the Fourth Proportional to 20,507.81, 28,300.41 and 11,555.10

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Solution

The fourth proportional to 20,507.81, 28,300.41 and 11,555.10 is: 15,945.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,507.81 : 28,300.41 = 11,555.10 : x
  2. Step 2: Convert to fraction form
    20,507.81/28,300.41 = 11,555.10/x
  3. Step 3: Cross multiply
    20,507.81x = 28,300.41 × 11,555.10
  4. Step 4: Simplify right side
    20,507.81x = 327,014,067.59
  5. Step 5: Solve for x
    x = 327,014,067.59/20,507.81
  6. Step 6: Final answer
    x = 15,945.83

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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.