Home / 1,985.87-2,739.26-1,278.63

Finding the Fourth Proportional to 1,985.87, 2,739.26 and 1,278.63

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Solution

The fourth proportional to 1,985.87, 2,739.26 and 1,278.63 is: 1,763.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.87 : 2,739.26 = 1,278.63 : x
  2. Step 2: Convert to fraction form
    1,985.87/2,739.26 = 1,278.63/x
  3. Step 3: Cross multiply
    1,985.87x = 2,739.26 × 1,278.63
  4. Step 4: Simplify right side
    1,985.87x = 3,502,493.62
  5. Step 5: Solve for x
    x = 3,502,493.62/1,985.87
  6. Step 6: Final answer
    x = 1,763.71

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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.