Home / 1,994.30-2,987.40-1,261.28

Finding the Fourth Proportional to 1,994.30, 2,987.40 and 1,261.28

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Solution

The fourth proportional to 1,994.30, 2,987.40 and 1,261.28 is: 1,889.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,994.30 : 2,987.40 = 1,261.28 : x
  2. Step 2: Convert to fraction form
    1,994.30/2,987.40 = 1,261.28/x
  3. Step 3: Cross multiply
    1,994.30x = 2,987.40 × 1,261.28
  4. Step 4: Simplify right side
    1,994.30x = 3,767,947.87
  5. Step 5: Solve for x
    x = 3,767,947.87/1,994.30
  6. Step 6: Final answer
    x = 1,889.36

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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.