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Finding the Fourth Proportional to 118,495.20, 177,310.80 and 87,391.20

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Solution

The fourth proportional to 118,495.20, 177,310.80 and 87,391.20 is: 130,768.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,495.20 : 177,310.80 = 87,391.20 : x
  2. Step 2: Convert to fraction form
    118,495.20/177,310.80 = 87,391.20/x
  3. Step 3: Cross multiply
    118,495.20x = 177,310.80 × 87,391.20
  4. Step 4: Simplify right side
    118,495.20x = 15,495,403,584.96
  5. Step 5: Solve for x
    x = 15,495,403,584.96/118,495.20
  6. Step 6: Final answer
    x = 130,768.20

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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.