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Finding the Fourth Proportional to 1,243.11, 1,715.67 and 739.25

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Solution

The fourth proportional to 1,243.11, 1,715.67 and 739.25 is: 1,020.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.11 : 1,715.67 = 739.25 : x
  2. Step 2: Convert to fraction form
    1,243.11/1,715.67 = 739.25/x
  3. Step 3: Cross multiply
    1,243.11x = 1,715.67 × 739.25
  4. Step 4: Simplify right side
    1,243.11x = 1,268,300.47
  5. Step 5: Solve for x
    x = 1,268,300.47/1,243.11
  6. Step 6: Final answer
    x = 1,020.26

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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.