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Finding the Fourth Proportional to 81,403.60, 121,959.60 and 69,739.60

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Solution

The fourth proportional to 81,403.60, 121,959.60 and 69,739.60 is: 104,484.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,403.60 : 121,959.60 = 69,739.60 : x
  2. Step 2: Convert to fraction form
    81,403.60/121,959.60 = 69,739.60/x
  3. Step 3: Cross multiply
    81,403.60x = 121,959.60 × 69,739.60
  4. Step 4: Simplify right side
    81,403.60x = 8,505,413,720.16
  5. Step 5: Solve for x
    x = 8,505,413,720.16/81,403.60
  6. Step 6: Final answer
    x = 104,484.49

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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.