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Finding the Fourth Proportional to 28,081, 38,751.78 and 18,145

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Solution

The fourth proportional to 28,081, 38,751.78 and 18,145 is: 25,040.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,081 : 38,751.78 = 18,145 : x
  2. Step 2: Convert to fraction form
    28,081/38,751.78 = 18,145/x
  3. Step 3: Cross multiply
    28,081x = 38,751.78 × 18,145
  4. Step 4: Simplify right side
    28,081x = 703,151,048.10
  5. Step 5: Solve for x
    x = 703,151,048.10/28,081
  6. Step 6: Final answer
    x = 25,040.10

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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.