Home / 1,985.63-2,739.39-1,387.97

Finding the Fourth Proportional to 1,985.63, 2,739.39 and 1,387.97

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Solution

The fourth proportional to 1,985.63, 2,739.39 and 1,387.97 is: 1,914.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.63 : 2,739.39 = 1,387.97 : x
  2. Step 2: Convert to fraction form
    1,985.63/2,739.39 = 1,387.97/x
  3. Step 3: Cross multiply
    1,985.63x = 2,739.39 × 1,387.97
  4. Step 4: Simplify right side
    1,985.63x = 3,802,177.44
  5. Step 5: Solve for x
    x = 3,802,177.44/1,985.63
  6. Step 6: Final answer
    x = 1,914.85

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1.5x scale

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.