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Finding the Fourth Proportional to 139,004.63, 191,829.33 and 78,571.67

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Solution

The fourth proportional to 139,004.63, 191,829.33 and 78,571.67 is: 108,430.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,004.63 : 191,829.33 = 78,571.67 : x
  2. Step 2: Convert to fraction form
    139,004.63/191,829.33 = 78,571.67/x
  3. Step 3: Cross multiply
    139,004.63x = 191,829.33 × 78,571.67
  4. Step 4: Simplify right side
    139,004.63x = 15,072,349,853.93
  5. Step 5: Solve for x
    x = 15,072,349,853.93/139,004.63
  6. Step 6: Final answer
    x = 108,430.56

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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.