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Finding the Fourth Proportional to 28,556.34, 39,405.69 and 15,809.10

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Solution

The fourth proportional to 28,556.34, 39,405.69 and 15,809.10 is: 21,815.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,556.34 : 39,405.69 = 15,809.10 : x
  2. Step 2: Convert to fraction form
    28,556.34/39,405.69 = 15,809.10/x
  3. Step 3: Cross multiply
    28,556.34x = 39,405.69 × 15,809.10
  4. Step 4: Simplify right side
    28,556.34x = 622,968,493.78
  5. Step 5: Solve for x
    x = 622,968,493.78/28,556.34
  6. Step 6: Final answer
    x = 21,815.42

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.