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Finding the Fourth Proportional to 76,912.40, 115,112.60 and 55,792.40

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Solution

The fourth proportional to 76,912.40, 115,112.60 and 55,792.40 is: 83,502.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,912.40 : 115,112.60 = 55,792.40 : x
  2. Step 2: Convert to fraction form
    76,912.40/115,112.60 = 55,792.40/x
  3. Step 3: Cross multiply
    76,912.40x = 115,112.60 × 55,792.40
  4. Step 4: Simplify right side
    76,912.40x = 6,422,408,224.24
  5. Step 5: Solve for x
    x = 6,422,408,224.24/76,912.40
  6. Step 6: Final answer
    x = 83,502.90

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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.