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Finding the Fourth Proportional to 1,979.63, 2,969.22 and 518.58

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Solution

The fourth proportional to 1,979.63, 2,969.22 and 518.58 is: 777.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.63 : 2,969.22 = 518.58 : x
  2. Step 2: Convert to fraction form
    1,979.63/2,969.22 = 518.58/x
  3. Step 3: Cross multiply
    1,979.63x = 2,969.22 × 518.58
  4. Step 4: Simplify right side
    1,979.63x = 1,539,778.11
  5. Step 5: Solve for x
    x = 1,539,778.11/1,979.63
  6. Step 6: Final answer
    x = 777.81

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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.