Home / 1,980.21-2,969.37-1,005.78

Finding the Fourth Proportional to 1,980.21, 2,969.37 and 1,005.78

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Solution

The fourth proportional to 1,980.21, 2,969.37 and 1,005.78 is: 1,508.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.21 : 2,969.37 = 1,005.78 : x
  2. Step 2: Convert to fraction form
    1,980.21/2,969.37 = 1,005.78/x
  3. Step 3: Cross multiply
    1,980.21x = 2,969.37 × 1,005.78
  4. Step 4: Simplify right side
    1,980.21x = 2,986,532.96
  5. Step 5: Solve for x
    x = 2,986,532.96/1,980.21
  6. Step 6: Final answer
    x = 1,508.19

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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.