Home / 1,291.72-1,936.25-511.41

Finding the Fourth Proportional to 1,291.72, 1,936.25 and 511.41

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Solution

The fourth proportional to 1,291.72, 1,936.25 and 511.41 is: 766.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.72 : 1,936.25 = 511.41 : x
  2. Step 2: Convert to fraction form
    1,291.72/1,936.25 = 511.41/x
  3. Step 3: Cross multiply
    1,291.72x = 1,936.25 × 511.41
  4. Step 4: Simplify right side
    1,291.72x = 990,207.93
  5. Step 5: Solve for x
    x = 990,207.93/1,291.72
  6. Step 6: Final answer
    x = 766.58

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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.