Home / 1,261.13-1,891.40-480.85

Finding the Fourth Proportional to 1,261.13, 1,891.40 and 480.85

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Solution

The fourth proportional to 1,261.13, 1,891.40 and 480.85 is: 721.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.13 : 1,891.40 = 480.85 : x
  2. Step 2: Convert to fraction form
    1,261.13/1,891.40 = 480.85/x
  3. Step 3: Cross multiply
    1,261.13x = 1,891.40 × 480.85
  4. Step 4: Simplify right side
    1,261.13x = 909,472.56
  5. Step 5: Solve for x
    x = 909,472.56/1,261.13
  6. Step 6: Final answer
    x = 721.16

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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.