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Finding the Fourth Proportional to 81,291.60, 121,791.60 and 69,627.60

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Solution

The fourth proportional to 81,291.60, 121,791.60 and 69,627.60 is: 104,316.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,291.60 : 121,791.60 = 69,627.60 : x
  2. Step 2: Convert to fraction form
    81,291.60/121,791.60 = 69,627.60/x
  3. Step 3: Cross multiply
    81,291.60x = 121,791.60 × 69,627.60
  4. Step 4: Simplify right side
    81,291.60x = 8,480,056,808.16
  5. Step 5: Solve for x
    x = 8,480,056,808.16/81,291.60
  6. Step 6: Final answer
    x = 104,316.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.