Home / 1,285.65-1,781.66-1,261.04

Finding the Fourth Proportional to 1,285.65, 1,781.66 and 1,261.04

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Solution

The fourth proportional to 1,285.65, 1,781.66 and 1,261.04 is: 1,747.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.65 : 1,781.66 = 1,261.04 : x
  2. Step 2: Convert to fraction form
    1,285.65/1,781.66 = 1,261.04/x
  3. Step 3: Cross multiply
    1,285.65x = 1,781.66 × 1,261.04
  4. Step 4: Simplify right side
    1,285.65x = 2,246,744.53
  5. Step 5: Solve for x
    x = 2,246,744.53/1,285.65
  6. Step 6: Final answer
    x = 1,747.56

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.