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Finding the Fourth Proportional to 1,261.84, 1,739.77 and 812.95

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Solution

The fourth proportional to 1,261.84, 1,739.77 and 812.95 is: 1,120.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.84 : 1,739.77 = 812.95 : x
  2. Step 2: Convert to fraction form
    1,261.84/1,739.77 = 812.95/x
  3. Step 3: Cross multiply
    1,261.84x = 1,739.77 × 812.95
  4. Step 4: Simplify right side
    1,261.84x = 1,414,339.64
  5. Step 5: Solve for x
    x = 1,414,339.64/1,261.84
  6. Step 6: Final answer
    x = 1,120.86

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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.