Home / 28,378.78-39,162.36-15,631.71

Finding the Fourth Proportional to 28,378.78, 39,162.36 and 15,631.71

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Solution

The fourth proportional to 28,378.78, 39,162.36 and 15,631.71 is: 21,571.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,378.78 : 39,162.36 = 15,631.71 : x
  2. Step 2: Convert to fraction form
    28,378.78/39,162.36 = 15,631.71/x
  3. Step 3: Cross multiply
    28,378.78x = 39,162.36 × 15,631.71
  4. Step 4: Simplify right side
    28,378.78x = 612,174,654.44
  5. Step 5: Solve for x
    x = 612,174,654.44/28,378.78
  6. Step 6: Final answer
    x = 21,571.56

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1.5x scale

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.