Home / 21,390.97-29,519.52-12,893.21

Finding the Fourth Proportional to 21,390.97, 29,519.52 and 12,893.21

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Solution

The fourth proportional to 21,390.97, 29,519.52 and 12,893.21 is: 17,792.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.97 : 29,519.52 = 12,893.21 : x
  2. Step 2: Convert to fraction form
    21,390.97/29,519.52 = 12,893.21/x
  3. Step 3: Cross multiply
    21,390.97x = 29,519.52 × 12,893.21
  4. Step 4: Simplify right side
    21,390.97x = 380,601,357.73
  5. Step 5: Solve for x
    x = 380,601,357.73/21,390.97
  6. Step 6: Final answer
    x = 17,792.62

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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.