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Finding the Fourth Proportional to 20,841, 28,760.88 and 11,409.36

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Solution

The fourth proportional to 20,841, 28,760.88 and 11,409.36 is: 15,745.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,841 : 28,760.88 = 11,409.36 : x
  2. Step 2: Convert to fraction form
    20,841/28,760.88 = 11,409.36/x
  3. Step 3: Cross multiply
    20,841x = 28,760.88 × 11,409.36
  4. Step 4: Simplify right side
    20,841x = 328,143,233.84
  5. Step 5: Solve for x
    x = 328,143,233.84/20,841
  6. Step 6: Final answer
    x = 15,745.08

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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.