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Finding the Fourth Proportional to 28,856, 39,821.36 and 15,608

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Solution

The fourth proportional to 28,856, 39,821.36 and 15,608 is: 21,539.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,856 : 39,821.36 = 15,608 : x
  2. Step 2: Convert to fraction form
    28,856/39,821.36 = 15,608/x
  3. Step 3: Cross multiply
    28,856x = 39,821.36 × 15,608
  4. Step 4: Simplify right side
    28,856x = 621,531,786.88
  5. Step 5: Solve for x
    x = 621,531,786.88/28,856
  6. Step 6: Final answer
    x = 21,539.08

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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.