Home / 21,561.90-29,753.82-12,128.64

Finding the Fourth Proportional to 21,561.90, 29,753.82 and 12,128.64

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Solution

The fourth proportional to 21,561.90, 29,753.82 and 12,128.64 is: 16,736.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,561.90 : 29,753.82 = 12,128.64 : x
  2. Step 2: Convert to fraction form
    21,561.90/29,753.82 = 12,128.64/x
  3. Step 3: Cross multiply
    21,561.90x = 29,753.82 × 12,128.64
  4. Step 4: Simplify right side
    21,561.90x = 360,873,371.40
  5. Step 5: Solve for x
    x = 360,873,371.40/21,561.90
  6. Step 6: Final answer
    x = 16,736.62

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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.