Home / 81,420.30-122,142.60-28,825.65

Finding the Fourth Proportional to 81,420.30, 122,142.60 and 28,825.65

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Solution

The fourth proportional to 81,420.30, 122,142.60 and 28,825.65 is: 43,242.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,420.30 : 122,142.60 = 28,825.65 : x
  2. Step 2: Convert to fraction form
    81,420.30/122,142.60 = 28,825.65/x
  3. Step 3: Cross multiply
    81,420.30x = 122,142.60 × 28,825.65
  4. Step 4: Simplify right side
    81,420.30x = 3,520,839,837.69
  5. Step 5: Solve for x
    x = 3,520,839,837.69/81,420.30
  6. Step 6: Final answer
    x = 43,242.78

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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.