Home / 1,991.31-2,989.13-1,686.93

Finding the Fourth Proportional to 1,991.31, 2,989.13 and 1,686.93

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Solution

The fourth proportional to 1,991.31, 2,989.13 and 1,686.93 is: 2,532.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.31 : 2,989.13 = 1,686.93 : x
  2. Step 2: Convert to fraction form
    1,991.31/2,989.13 = 1,686.93/x
  3. Step 3: Cross multiply
    1,991.31x = 2,989.13 × 1,686.93
  4. Step 4: Simplify right side
    1,991.31x = 5,042,444.64
  5. Step 5: Solve for x
    x = 5,042,444.64/1,991.31
  6. Step 6: Final answer
    x = 2,532.22

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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.