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Finding the Fourth Proportional to 76,994.80, 115,492.20 and 68,441.20

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Solution

The fourth proportional to 76,994.80, 115,492.20 and 68,441.20 is: 102,661.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,994.80 : 115,492.20 = 68,441.20 : x
  2. Step 2: Convert to fraction form
    76,994.80/115,492.20 = 68,441.20/x
  3. Step 3: Cross multiply
    76,994.80x = 115,492.20 × 68,441.20
  4. Step 4: Simplify right side
    76,994.80x = 7,904,424,758.64
  5. Step 5: Solve for x
    x = 7,904,424,758.64/76,994.80
  6. Step 6: Final answer
    x = 102,661.80

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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.