Home / 81,989.10-122,983.65-74,115.90

Finding the Fourth Proportional to 81,989.10, 122,983.65 and 74,115.90

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Solution

The fourth proportional to 81,989.10, 122,983.65 and 74,115.90 is: 111,173.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,989.10 : 122,983.65 = 74,115.90 : x
  2. Step 2: Convert to fraction form
    81,989.10/122,983.65 = 74,115.90/x
  3. Step 3: Cross multiply
    81,989.10x = 122,983.65 × 74,115.90
  4. Step 4: Simplify right side
    81,989.10x = 9,115,043,905.04
  5. Step 5: Solve for x
    x = 9,115,043,905.04/81,989.10
  6. Step 6: Final answer
    x = 111,173.85

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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.