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Finding the Fourth Proportional to 139,398.84, 192,328.02 and 78,959.88

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Solution

The fourth proportional to 139,398.84, 192,328.02 and 78,959.88 is: 108,940.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,398.84 : 192,328.02 = 78,959.88 : x
  2. Step 2: Convert to fraction form
    139,398.84/192,328.02 = 78,959.88/x
  3. Step 3: Cross multiply
    139,398.84x = 192,328.02 × 78,959.88
  4. Step 4: Simplify right side
    139,398.84x = 15,186,197,379.84
  5. Step 5: Solve for x
    x = 15,186,197,379.84/139,398.84
  6. Step 6: Final answer
    x = 108,940.63

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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.