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Finding the Fourth Proportional to 98,736, 136,254.78 and 55,715.79

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Solution

The fourth proportional to 98,736, 136,254.78 and 55,715.79 is: 76,887.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,736 : 136,254.78 = 55,715.79 : x
  2. Step 2: Convert to fraction form
    98,736/136,254.78 = 55,715.79/x
  3. Step 3: Cross multiply
    98,736x = 136,254.78 × 55,715.79
  4. Step 4: Simplify right side
    98,736x = 7,591,542,708.98
  5. Step 5: Solve for x
    x = 7,591,542,708.98/98,736
  6. Step 6: Final answer
    x = 76,887.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.