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Finding the Fourth Proportional to 1,261.83, 1,891.71 and 481.65

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Solution

The fourth proportional to 1,261.83, 1,891.71 and 481.65 is: 722.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.83 : 1,891.71 = 481.65 : x
  2. Step 2: Convert to fraction form
    1,261.83/1,891.71 = 481.65/x
  3. Step 3: Cross multiply
    1,261.83x = 1,891.71 × 481.65
  4. Step 4: Simplify right side
    1,261.83x = 911,142.12
  5. Step 5: Solve for x
    x = 911,142.12/1,261.83
  6. Step 6: Final answer
    x = 722.08

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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.