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Finding the Fourth Proportional to 121,918.29, 168,273.57 and 74,187.01

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Solution

The fourth proportional to 121,918.29, 168,273.57 and 74,187.01 is: 102,394.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,918.29 : 168,273.57 = 74,187.01 : x
  2. Step 2: Convert to fraction form
    121,918.29/168,273.57 = 74,187.01/x
  3. Step 3: Cross multiply
    121,918.29x = 168,273.57 × 74,187.01
  4. Step 4: Simplify right side
    121,918.29x = 12,483,713,020.33
  5. Step 5: Solve for x
    x = 12,483,713,020.33/121,918.29
  6. Step 6: Final answer
    x = 102,394.10

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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.