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Finding the Fourth Proportional to 1,263.78, 1,743.78 and 739.68

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Solution

The fourth proportional to 1,263.78, 1,743.78 and 739.68 is: 1,020.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,263.78 : 1,743.78 = 739.68 : x
  2. Step 2: Convert to fraction form
    1,263.78/1,743.78 = 739.68/x
  3. Step 3: Cross multiply
    1,263.78x = 1,743.78 × 739.68
  4. Step 4: Simplify right side
    1,263.78x = 1,289,839.19
  5. Step 5: Solve for x
    x = 1,289,839.19/1,263.78
  6. Step 6: Final answer
    x = 1,020.62

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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.