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Finding the Fourth Proportional to 28,269, 39,012.30 and 15,693.48

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Solution

The fourth proportional to 28,269, 39,012.30 and 15,693.48 is: 21,657.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,269 : 39,012.30 = 15,693.48 : x
  2. Step 2: Convert to fraction form
    28,269/39,012.30 = 15,693.48/x
  3. Step 3: Cross multiply
    28,269x = 39,012.30 × 15,693.48
  4. Step 4: Simplify right side
    28,269x = 612,238,749.80
  5. Step 5: Solve for x
    x = 612,238,749.80/28,269
  6. Step 6: Final answer
    x = 21,657.60

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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.