Home / 1,988.16-2,979.96-1,012.20

Finding the Fourth Proportional to 1,988.16, 2,979.96 and 1,012.20

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Solution

The fourth proportional to 1,988.16, 2,979.96 and 1,012.20 is: 1,517.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.16 : 2,979.96 = 1,012.20 : x
  2. Step 2: Convert to fraction form
    1,988.16/2,979.96 = 1,012.20/x
  3. Step 3: Cross multiply
    1,988.16x = 2,979.96 × 1,012.20
  4. Step 4: Simplify right side
    1,988.16x = 3,016,315.51
  5. Step 5: Solve for x
    x = 3,016,315.51/1,988.16
  6. Step 6: Final answer
    x = 1,517.14

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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.