Home / 1,988.12-2,980.47-1,329.97

Finding the Fourth Proportional to 1,988.12, 2,980.47 and 1,329.97

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Solution

The fourth proportional to 1,988.12, 2,980.47 and 1,329.97 is: 1,993.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.12 : 2,980.47 = 1,329.97 : x
  2. Step 2: Convert to fraction form
    1,988.12/2,980.47 = 1,329.97/x
  3. Step 3: Cross multiply
    1,988.12x = 2,980.47 × 1,329.97
  4. Step 4: Simplify right side
    1,988.12x = 3,963,935.07
  5. Step 5: Solve for x
    x = 3,963,935.07/1,988.12
  6. Step 6: Final answer
    x = 1,993.81

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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.