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Finding the Fourth Proportional to 131,640.93, 197,264.43 and 78,992.55

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Solution

The fourth proportional to 131,640.93, 197,264.43 and 78,992.55 is: 118,370.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,640.93 : 197,264.43 = 78,992.55 : x
  2. Step 2: Convert to fraction form
    131,640.93/197,264.43 = 78,992.55/x
  3. Step 3: Cross multiply
    131,640.93x = 197,264.43 × 78,992.55
  4. Step 4: Simplify right side
    131,640.93x = 15,582,420,350.00
  5. Step 5: Solve for x
    x = 15,582,420,350.00/131,640.93
  6. Step 6: Final answer
    x = 118,370.63

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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.