Home / 1,985.91-2,739.87-1,239.36

Finding the Fourth Proportional to 1,985.91, 2,739.87 and 1,239.36

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Solution

The fourth proportional to 1,985.91, 2,739.87 and 1,239.36 is: 1,709.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.91 : 2,739.87 = 1,239.36 : x
  2. Step 2: Convert to fraction form
    1,985.91/2,739.87 = 1,239.36/x
  3. Step 3: Cross multiply
    1,985.91x = 2,739.87 × 1,239.36
  4. Step 4: Simplify right side
    1,985.91x = 3,395,685.28
  5. Step 5: Solve for x
    x = 3,395,685.28/1,985.91
  6. Step 6: Final answer
    x = 1,709.89

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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.