Home / 20,840.28-28,759.64-11,409.45

Finding the Fourth Proportional to 20,840.28, 28,759.64 and 11,409.45

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Solution

The fourth proportional to 20,840.28, 28,759.64 and 11,409.45 is: 15,745.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.28 : 28,759.64 = 11,409.45 : x
  2. Step 2: Convert to fraction form
    20,840.28/28,759.64 = 11,409.45/x
  3. Step 3: Cross multiply
    20,840.28x = 28,759.64 × 11,409.45
  4. Step 4: Simplify right side
    20,840.28x = 328,131,617.55
  5. Step 5: Solve for x
    x = 328,131,617.55/20,840.28
  6. Step 6: Final answer
    x = 15,745.07

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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.