Home / 28,724.78-39,640.86-15,978.48

Finding the Fourth Proportional to 28,724.78, 39,640.86 and 15,978.48

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Solution

The fourth proportional to 28,724.78, 39,640.86 and 15,978.48 is: 22,050.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,724.78 : 39,640.86 = 15,978.48 : x
  2. Step 2: Convert to fraction form
    28,724.78/39,640.86 = 15,978.48/x
  3. Step 3: Cross multiply
    28,724.78x = 39,640.86 × 15,978.48
  4. Step 4: Simplify right side
    28,724.78x = 633,400,688.69
  5. Step 5: Solve for x
    x = 633,400,688.69/28,724.78
  6. Step 6: Final answer
    x = 22,050.67

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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.