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Finding the Fourth Proportional to 121,758.69, 168,078.73 and 74,027.28

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Solution

The fourth proportional to 121,758.69, 168,078.73 and 74,027.28 is: 102,189.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,758.69 : 168,078.73 = 74,027.28 : x
  2. Step 2: Convert to fraction form
    121,758.69/168,078.73 = 74,027.28/x
  3. Step 3: Cross multiply
    121,758.69x = 168,078.73 × 74,027.28
  4. Step 4: Simplify right side
    121,758.69x = 12,442,411,791.78
  5. Step 5: Solve for x
    x = 12,442,411,791.78/121,758.69
  6. Step 6: Final answer
    x = 102,189.10

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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.