Home / 1,979.51-2,969.28-518.81

Finding the Fourth Proportional to 1,979.51, 2,969.28 and 518.81

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Solution

The fourth proportional to 1,979.51, 2,969.28 and 518.81 is: 778.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.51 : 2,969.28 = 518.81 : x
  2. Step 2: Convert to fraction form
    1,979.51/2,969.28 = 518.81/x
  3. Step 3: Cross multiply
    1,979.51x = 2,969.28 × 518.81
  4. Step 4: Simplify right side
    1,979.51x = 1,540,477.31
  5. Step 5: Solve for x
    x = 1,540,477.31/1,979.51
  6. Step 6: Final answer
    x = 778.21

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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.