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Finding the Fourth Proportional to 98,640.70, 136,121.40 and 55,619.80

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Solution

The fourth proportional to 98,640.70, 136,121.40 and 55,619.80 is: 76,753.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,640.70 : 136,121.40 = 55,619.80 : x
  2. Step 2: Convert to fraction form
    98,640.70/136,121.40 = 55,619.80/x
  3. Step 3: Cross multiply
    98,640.70x = 136,121.40 × 55,619.80
  4. Step 4: Simplify right side
    98,640.70x = 7,571,045,043.72
  5. Step 5: Solve for x
    x = 7,571,045,043.72/98,640.70
  6. Step 6: Final answer
    x = 76,753.76

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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.