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Finding the Fourth Proportional to 81,010.60, 121,463.10 and 72,716.20

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Solution

The fourth proportional to 81,010.60, 121,463.10 and 72,716.20 is: 109,026.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,010.60 : 121,463.10 = 72,716.20 : x
  2. Step 2: Convert to fraction form
    81,010.60/121,463.10 = 72,716.20/x
  3. Step 3: Cross multiply
    81,010.60x = 121,463.10 × 72,716.20
  4. Step 4: Simplify right side
    81,010.60x = 8,832,335,072.22
  5. Step 5: Solve for x
    x = 8,832,335,072.22/81,010.60
  6. Step 6: Final answer
    x = 109,026.91

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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.