Home / 20,830.25-28,745.75-11,398.81

Finding the Fourth Proportional to 20,830.25, 28,745.75 and 11,398.81

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Solution

The fourth proportional to 20,830.25, 28,745.75 and 11,398.81 is: 15,730.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.25 : 28,745.75 = 11,398.81 : x
  2. Step 2: Convert to fraction form
    20,830.25/28,745.75 = 11,398.81/x
  3. Step 3: Cross multiply
    20,830.25x = 28,745.75 × 11,398.81
  4. Step 4: Simplify right side
    20,830.25x = 327,667,342.56
  5. Step 5: Solve for x
    x = 327,667,342.56/20,830.25
  6. Step 6: Final answer
    x = 15,730.36

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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.