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Finding the Fourth Proportional to 38,809, 53,556.42 and 21,145

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Solution

The fourth proportional to 38,809, 53,556.42 and 21,145 is: 29,180.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,809 : 53,556.42 = 21,145 : x
  2. Step 2: Convert to fraction form
    38,809/53,556.42 = 21,145/x
  3. Step 3: Cross multiply
    38,809x = 53,556.42 × 21,145
  4. Step 4: Simplify right side
    38,809x = 1,132,450,500.90
  5. Step 5: Solve for x
    x = 1,132,450,500.90/38,809
  6. Step 6: Final answer
    x = 29,180.10

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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.