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Finding the Fourth Proportional to 81,003.60, 121,452.60 and 72,709.20

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Solution

The fourth proportional to 81,003.60, 121,452.60 and 72,709.20 is: 109,016.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,003.60 : 121,452.60 = 72,709.20 : x
  2. Step 2: Convert to fraction form
    81,003.60/121,452.60 = 72,709.20/x
  3. Step 3: Cross multiply
    81,003.60x = 121,452.60 × 72,709.20
  4. Step 4: Simplify right side
    81,003.60x = 8,830,721,383.92
  5. Step 5: Solve for x
    x = 8,830,721,383.92/81,003.60
  6. Step 6: Final answer
    x = 109,016.41

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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.