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Finding the Fourth Proportional to 139,390.45, 192,362.78 and 75,732.14

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Solution

The fourth proportional to 139,390.45, 192,362.78 and 75,732.14 is: 104,512.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,390.45 : 192,362.78 = 75,732.14 : x
  2. Step 2: Convert to fraction form
    139,390.45/192,362.78 = 75,732.14/x
  3. Step 3: Cross multiply
    139,390.45x = 192,362.78 × 75,732.14
  4. Step 4: Simplify right side
    139,390.45x = 14,568,044,985.75
  5. Step 5: Solve for x
    x = 14,568,044,985.75/139,390.45
  6. Step 6: Final answer
    x = 104,512.50

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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.