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Finding the Fourth Proportional to 28,876.50, 39,849.59 and 15,628.50

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Solution

The fourth proportional to 28,876.50, 39,849.59 and 15,628.50 is: 21,567.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,876.50 : 39,849.59 = 15,628.50 : x
  2. Step 2: Convert to fraction form
    28,876.50/39,849.59 = 15,628.50/x
  3. Step 3: Cross multiply
    28,876.50x = 39,849.59 × 15,628.50
  4. Step 4: Simplify right side
    28,876.50x = 622,789,317.32
  5. Step 5: Solve for x
    x = 622,789,317.32/28,876.50
  6. Step 6: Final answer
    x = 21,567.34

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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.