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Finding the Fourth Proportional to 28,638, 39,537.72 and 18,719.28

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Solution

The fourth proportional to 28,638, 39,537.72 and 18,719.28 is: 25,843.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,638 : 39,537.72 = 18,719.28 : x
  2. Step 2: Convert to fraction form
    28,638/39,537.72 = 18,719.28/x
  3. Step 3: Cross multiply
    28,638x = 39,537.72 × 18,719.28
  4. Step 4: Simplify right side
    28,638x = 740,117,651.24
  5. Step 5: Solve for x
    x = 740,117,651.24/28,638
  6. Step 6: Final answer
    x = 25,843.90

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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.