Home / 1,991.47-2,988.75-1,379.46

Finding the Fourth Proportional to 1,991.47, 2,988.75 and 1,379.46

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Solution

The fourth proportional to 1,991.47, 2,988.75 and 1,379.46 is: 2,070.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.47 : 2,988.75 = 1,379.46 : x
  2. Step 2: Convert to fraction form
    1,991.47/2,988.75 = 1,379.46/x
  3. Step 3: Cross multiply
    1,991.47x = 2,988.75 × 1,379.46
  4. Step 4: Simplify right side
    1,991.47x = 4,122,854.18
  5. Step 5: Solve for x
    x = 4,122,854.18/1,991.47
  6. Step 6: Final answer
    x = 2,070.26

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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.