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Finding the Fourth Proportional to 21,755.40, 30,022.41 and 13,257.51

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Solution

The fourth proportional to 21,755.40, 30,022.41 and 13,257.51 is: 18,295.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,755.40 : 30,022.41 = 13,257.51 : x
  2. Step 2: Convert to fraction form
    21,755.40/30,022.41 = 13,257.51/x
  3. Step 3: Cross multiply
    21,755.40x = 30,022.41 × 13,257.51
  4. Step 4: Simplify right side
    21,755.40x = 398,022,400.80
  5. Step 5: Solve for x
    x = 398,022,400.80/21,755.40
  6. Step 6: Final answer
    x = 18,295.34

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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.