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Finding the Fourth Proportional to 118,996.20, 178,148.70 and 115,540.20

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Solution

The fourth proportional to 118,996.20, 178,148.70 and 115,540.20 is: 172,974.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,996.20 : 178,148.70 = 115,540.20 : x
  2. Step 2: Convert to fraction form
    118,996.20/178,148.70 = 115,540.20/x
  3. Step 3: Cross multiply
    118,996.20x = 178,148.70 × 115,540.20
  4. Step 4: Simplify right side
    118,996.20x = 20,583,336,427.74
  5. Step 5: Solve for x
    x = 20,583,336,427.74/118,996.20
  6. Step 6: Final answer
    x = 172,974.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.