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Finding the Fourth Proportional to 121,938.56, 168,290.64 and 74,189.04

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Solution

The fourth proportional to 121,938.56, 168,290.64 and 74,189.04 is: 102,390.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,938.56 : 168,290.64 = 74,189.04 : x
  2. Step 2: Convert to fraction form
    121,938.56/168,290.64 = 74,189.04/x
  3. Step 3: Cross multiply
    121,938.56x = 168,290.64 × 74,189.04
  4. Step 4: Simplify right side
    121,938.56x = 12,485,321,022.59
  5. Step 5: Solve for x
    x = 12,485,321,022.59/121,938.56
  6. Step 6: Final answer
    x = 102,390.26

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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.