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Finding the Fourth Proportional to 98,486.28, 135,858.96 and 74,571.48

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Solution

The fourth proportional to 98,486.28, 135,858.96 and 74,571.48 is: 102,869.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,486.28 : 135,858.96 = 74,571.48 : x
  2. Step 2: Convert to fraction form
    98,486.28/135,858.96 = 74,571.48/x
  3. Step 3: Cross multiply
    98,486.28x = 135,858.96 × 74,571.48
  4. Step 4: Simplify right side
    98,486.28x = 10,131,203,718.46
  5. Step 5: Solve for x
    x = 10,131,203,718.46/98,486.28
  6. Step 6: Final answer
    x = 102,869.19

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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.