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Finding the Fourth Proportional to 139,421.99, 192,401.68 and 78,992.52

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Solution

The fourth proportional to 139,421.99, 192,401.68 and 78,992.52 is: 109,009.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,421.99 : 192,401.68 = 78,992.52 : x
  2. Step 2: Convert to fraction form
    139,421.99/192,401.68 = 78,992.52/x
  3. Step 3: Cross multiply
    139,421.99x = 192,401.68 × 78,992.52
  4. Step 4: Simplify right side
    139,421.99x = 15,198,293,555.43
  5. Step 5: Solve for x
    x = 15,198,293,555.43/139,421.99
  6. Step 6: Final answer
    x = 109,009.30

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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.