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Finding the Fourth Proportional to 139,423.44, 192,388.73 and 78,981.14

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Solution

The fourth proportional to 139,423.44, 192,388.73 and 78,981.14 is: 108,985.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,423.44 : 192,388.73 = 78,981.14 : x
  2. Step 2: Convert to fraction form
    139,423.44/192,388.73 = 78,981.14/x
  3. Step 3: Cross multiply
    139,423.44x = 192,388.73 × 78,981.14
  4. Step 4: Simplify right side
    139,423.44x = 15,195,081,896.98
  5. Step 5: Solve for x
    x = 15,195,081,896.98/139,423.44
  6. Step 6: Final answer
    x = 108,985.13

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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.