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Finding the Fourth Proportional to 118,379.78, 163,368.90 and 68,078.78

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Solution

The fourth proportional to 118,379.78, 163,368.90 and 68,078.78 is: 93,951.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,379.78 : 163,368.90 = 68,078.78 : x
  2. Step 2: Convert to fraction form
    118,379.78/163,368.90 = 68,078.78/x
  3. Step 3: Cross multiply
    118,379.78x = 163,368.90 × 68,078.78
  4. Step 4: Simplify right side
    118,379.78x = 11,121,955,401.94
  5. Step 5: Solve for x
    x = 11,121,955,401.94/118,379.78
  6. Step 6: Final answer
    x = 93,951.48

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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.