Home / 1,979.21-2,968.80-518.34

Finding the Fourth Proportional to 1,979.21, 2,968.80 and 518.34

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Solution

The fourth proportional to 1,979.21, 2,968.80 and 518.34 is: 777.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.21 : 2,968.80 = 518.34 : x
  2. Step 2: Convert to fraction form
    1,979.21/2,968.80 = 518.34/x
  3. Step 3: Cross multiply
    1,979.21x = 2,968.80 × 518.34
  4. Step 4: Simplify right side
    1,979.21x = 1,538,847.79
  5. Step 5: Solve for x
    x = 1,538,847.79/1,979.21
  6. Step 6: Final answer
    x = 777.51

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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.