Home / 28,378.72-39,162.26-15,631.66

Finding the Fourth Proportional to 28,378.72, 39,162.26 and 15,631.66

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Solution

The fourth proportional to 28,378.72, 39,162.26 and 15,631.66 is: 21,571.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,378.72 : 39,162.26 = 15,631.66 : x
  2. Step 2: Convert to fraction form
    28,378.72/39,162.26 = 15,631.66/x
  3. Step 3: Cross multiply
    28,378.72x = 39,162.26 × 15,631.66
  4. Step 4: Simplify right side
    28,378.72x = 612,171,133.15
  5. Step 5: Solve for x
    x = 612,171,133.15/28,378.72
  6. Step 6: Final answer
    x = 21,571.49

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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.