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Finding the Fourth Proportional to 1,263.56, 1,743.80 and 739.76

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Solution

The fourth proportional to 1,263.56, 1,743.80 and 739.76 is: 1,020.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.56 : 1,743.80 = 739.76 : x
  2. Step 2: Convert to fraction form
    1,263.56/1,743.80 = 739.76/x
  3. Step 3: Cross multiply
    1,263.56x = 1,743.80 × 739.76
  4. Step 4: Simplify right side
    1,263.56x = 1,289,993.49
  5. Step 5: Solve for x
    x = 1,289,993.49/1,263.56
  6. Step 6: Final answer
    x = 1,020.92

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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.