Home / 79,821.12-119,721.96-20,651.88

Finding the Fourth Proportional to 79,821.12, 119,721.96 and 20,651.88

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Solution

The fourth proportional to 79,821.12, 119,721.96 and 20,651.88 is: 30,975.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,821.12 : 119,721.96 = 20,651.88 : x
  2. Step 2: Convert to fraction form
    79,821.12/119,721.96 = 20,651.88/x
  3. Step 3: Cross multiply
    79,821.12x = 119,721.96 × 20,651.88
  4. Step 4: Simplify right side
    79,821.12x = 2,472,483,551.28
  5. Step 5: Solve for x
    x = 2,472,483,551.28/79,821.12
  6. Step 6: Final answer
    x = 30,975.31

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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.