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Finding the Fourth Proportional to 18,143.25, 25,029.18 and 12,840.99

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Solution

The fourth proportional to 18,143.25, 25,029.18 and 12,840.99 is: 17,714.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,143.25 : 25,029.18 = 12,840.99 : x
  2. Step 2: Convert to fraction form
    18,143.25/25,029.18 = 12,840.99/x
  3. Step 3: Cross multiply
    18,143.25x = 25,029.18 × 12,840.99
  4. Step 4: Simplify right side
    18,143.25x = 321,399,450.09
  5. Step 5: Solve for x
    x = 321,399,450.09/18,143.25
  6. Step 6: Final answer
    x = 17,714.55

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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.