Home / 21,128.12-29,170.56-13,577.36

Finding the Fourth Proportional to 21,128.12, 29,170.56 and 13,577.36

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Solution

The fourth proportional to 21,128.12, 29,170.56 and 13,577.36 is: 18,745.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.12 : 29,170.56 = 13,577.36 : x
  2. Step 2: Convert to fraction form
    21,128.12/29,170.56 = 13,577.36/x
  3. Step 3: Cross multiply
    21,128.12x = 29,170.56 × 13,577.36
  4. Step 4: Simplify right side
    21,128.12x = 396,059,194.52
  5. Step 5: Solve for x
    x = 396,059,194.52/21,128.12
  6. Step 6: Final answer
    x = 18,745.60

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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.