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Finding the Fourth Proportional to 139,424.25, 192,389.85 and 78,981.95

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Solution

The fourth proportional to 139,424.25, 192,389.85 and 78,981.95 is: 108,986.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,424.25 : 192,389.85 = 78,981.95 : x
  2. Step 2: Convert to fraction form
    139,424.25/192,389.85 = 78,981.95/x
  3. Step 3: Cross multiply
    139,424.25x = 192,389.85 × 78,981.95
  4. Step 4: Simplify right side
    139,424.25x = 15,195,325,513.21
  5. Step 5: Solve for x
    x = 15,195,325,513.21/139,424.25
  6. Step 6: Final answer
    x = 108,986.25

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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.