Home / 81,771.10-122,660.70-42,405.10

Finding the Fourth Proportional to 81,771.10, 122,660.70 and 42,405.10

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Solution

The fourth proportional to 81,771.10, 122,660.70 and 42,405.10 is: 63,609.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,771.10 : 122,660.70 = 42,405.10 : x
  2. Step 2: Convert to fraction form
    81,771.10/122,660.70 = 42,405.10/x
  3. Step 3: Cross multiply
    81,771.10x = 122,660.70 × 42,405.10
  4. Step 4: Simplify right side
    81,771.10x = 5,201,439,249.57
  5. Step 5: Solve for x
    x = 5,201,439,249.57/81,771.10
  6. Step 6: Final answer
    x = 63,609.75

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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.