Home / 1,985.78-2,738.48-1,276.90

Finding the Fourth Proportional to 1,985.78, 2,738.48 and 1,276.90

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Solution

The fourth proportional to 1,985.78, 2,738.48 and 1,276.90 is: 1,760.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.78 : 2,738.48 = 1,276.90 : x
  2. Step 2: Convert to fraction form
    1,985.78/2,738.48 = 1,276.90/x
  3. Step 3: Cross multiply
    1,985.78x = 2,738.48 × 1,276.90
  4. Step 4: Simplify right side
    1,985.78x = 3,496,751.88
  5. Step 5: Solve for x
    x = 3,496,751.88/1,985.78
  6. Step 6: Final answer
    x = 1,760.89

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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.