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Finding the Fourth Proportional to 1,260.81, 1,739.10 and 813.25

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Solution

The fourth proportional to 1,260.81, 1,739.10 and 813.25 is: 1,121.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.81 : 1,739.10 = 813.25 : x
  2. Step 2: Convert to fraction form
    1,260.81/1,739.10 = 813.25/x
  3. Step 3: Cross multiply
    1,260.81x = 1,739.10 × 813.25
  4. Step 4: Simplify right side
    1,260.81x = 1,414,320.96
  5. Step 5: Solve for x
    x = 1,414,320.96/1,260.81
  6. Step 6: Final answer
    x = 1,121.76

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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.