Home / 2,987.32-4,121.40-1,939

Finding the Fourth Proportional to 2,987.32, 4,121.40 and 1,939

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Solution

The fourth proportional to 2,987.32, 4,121.40 and 1,939 is: 2,675.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.32 : 4,121.40 = 1,939 : x
  2. Step 2: Convert to fraction form
    2,987.32/4,121.40 = 1,939/x
  3. Step 3: Cross multiply
    2,987.32x = 4,121.40 × 1,939
  4. Step 4: Simplify right side
    2,987.32x = 7,991,394.60
  5. Step 5: Solve for x
    x = 7,991,394.60/2,987.32
  6. Step 6: Final answer
    x = 2,675.10

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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.