Home / 1,261.70-1,743.45-911.78

Finding the Fourth Proportional to 1,261.70, 1,743.45 and 911.78

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Solution

The fourth proportional to 1,261.70, 1,743.45 and 911.78 is: 1,259.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.70 : 1,743.45 = 911.78 : x
  2. Step 2: Convert to fraction form
    1,261.70/1,743.45 = 911.78/x
  3. Step 3: Cross multiply
    1,261.70x = 1,743.45 × 911.78
  4. Step 4: Simplify right side
    1,261.70x = 1,589,642.84
  5. Step 5: Solve for x
    x = 1,589,642.84/1,261.70
  6. Step 6: Final answer
    x = 1,259.92

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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.