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Finding the Fourth Proportional to 139,423.25, 192,388.47 and 78,980.95

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Solution

The fourth proportional to 139,423.25, 192,388.47 and 78,980.95 is: 108,984.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,423.25 : 192,388.47 = 78,980.95 : x
  2. Step 2: Convert to fraction form
    139,423.25/192,388.47 = 78,980.95/x
  3. Step 3: Cross multiply
    139,423.25x = 192,388.47 × 78,980.95
  4. Step 4: Simplify right side
    139,423.25x = 15,195,024,518.22
  5. Step 5: Solve for x
    x = 15,195,024,518.22/139,423.25
  6. Step 6: Final answer
    x = 108,984.87

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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.