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Finding the Fourth Proportional to 131,640.60, 197,201.70 and 78,893.40

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Solution

The fourth proportional to 131,640.60, 197,201.70 and 78,893.40 is: 118,184.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,640.60 : 197,201.70 = 78,893.40 : x
  2. Step 2: Convert to fraction form
    131,640.60/197,201.70 = 78,893.40/x
  3. Step 3: Cross multiply
    131,640.60x = 197,201.70 × 78,893.40
  4. Step 4: Simplify right side
    131,640.60x = 15,557,912,598.78
  5. Step 5: Solve for x
    x = 15,557,912,598.78/131,640.60
  6. Step 6: Final answer
    x = 118,184.76

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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.