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Finding the Fourth Proportional to 28,675.80, 43,015.32 and 9,947.79

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Solution

The fourth proportional to 28,675.80, 43,015.32 and 9,947.79 is: 14,922.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,675.80 : 43,015.32 = 9,947.79 : x
  2. Step 2: Convert to fraction form
    28,675.80/43,015.32 = 9,947.79/x
  3. Step 3: Cross multiply
    28,675.80x = 43,015.32 × 9,947.79
  4. Step 4: Simplify right side
    28,675.80x = 427,907,370.14
  5. Step 5: Solve for x
    x = 427,907,370.14/28,675.80
  6. Step 6: Final answer
    x = 14,922.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.