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Finding the Fourth Proportional to 28,278, 39,025.26 and 15,703.56

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Solution

The fourth proportional to 28,278, 39,025.26 and 15,703.56 is: 21,671.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,278 : 39,025.26 = 15,703.56 : x
  2. Step 2: Convert to fraction form
    28,278/39,025.26 = 15,703.56/x
  3. Step 3: Cross multiply
    28,278x = 39,025.26 × 15,703.56
  4. Step 4: Simplify right side
    28,278x = 612,835,511.93
  5. Step 5: Solve for x
    x = 612,835,511.93/28,278
  6. Step 6: Final answer
    x = 21,671.81

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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.