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Finding the Fourth Proportional to 139,438, 192,425.66 and 75,775.80

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Solution

The fourth proportional to 139,438, 192,425.66 and 75,775.80 is: 104,571.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,438 : 192,425.66 = 75,775.80 : x
  2. Step 2: Convert to fraction form
    139,438/192,425.66 = 75,775.80/x
  3. Step 3: Cross multiply
    139,438x = 192,425.66 × 75,775.80
  4. Step 4: Simplify right side
    139,438x = 14,581,208,327.03
  5. Step 5: Solve for x
    x = 14,581,208,327.03/139,438
  6. Step 6: Final answer
    x = 104,571.27

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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.