Home / 1,989.63-2,739.78-1,429.11

Finding the Fourth Proportional to 1,989.63, 2,739.78 and 1,429.11

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Solution

The fourth proportional to 1,989.63, 2,739.78 and 1,429.11 is: 1,967.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.63 : 2,739.78 = 1,429.11 : x
  2. Step 2: Convert to fraction form
    1,989.63/2,739.78 = 1,429.11/x
  3. Step 3: Cross multiply
    1,989.63x = 2,739.78 × 1,429.11
  4. Step 4: Simplify right side
    1,989.63x = 3,915,447.00
  5. Step 5: Solve for x
    x = 3,915,447.00/1,989.63
  6. Step 6: Final answer
    x = 1,967.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.