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Finding the Fourth Proportional to 81,008.60, 121,512.90 and 76,415.90

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Solution

The fourth proportional to 81,008.60, 121,512.90 and 76,415.90 is: 114,623.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,008.60 : 121,512.90 = 76,415.90 : x
  2. Step 2: Convert to fraction form
    81,008.60/121,512.90 = 76,415.90/x
  3. Step 3: Cross multiply
    81,008.60x = 121,512.90 × 76,415.90
  4. Step 4: Simplify right side
    81,008.60x = 9,285,517,615.11
  5. Step 5: Solve for x
    x = 9,285,517,615.11/81,008.60
  6. Step 6: Final answer
    x = 114,623.85

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1.5x scale

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.