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Finding the Fourth Proportional to 98,081.79, 135,348.87 and 55,639.41

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Solution

The fourth proportional to 98,081.79, 135,348.87 and 55,639.41 is: 76,780.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,081.79 : 135,348.87 = 55,639.41 : x
  2. Step 2: Convert to fraction form
    98,081.79/135,348.87 = 55,639.41/x
  3. Step 3: Cross multiply
    98,081.79x = 135,348.87 × 55,639.41
  4. Step 4: Simplify right side
    98,081.79x = 7,530,731,270.97
  5. Step 5: Solve for x
    x = 7,530,731,270.97/98,081.79
  6. Step 6: Final answer
    x = 76,780.12

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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.