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Finding the Fourth Proportional to 739.92, 1,020.71 and 687.15

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Solution

The fourth proportional to 739.92, 1,020.71 and 687.15 is: 947.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.92 : 1,020.71 = 687.15 : x
  2. Step 2: Convert to fraction form
    739.92/1,020.71 = 687.15/x
  3. Step 3: Cross multiply
    739.92x = 1,020.71 × 687.15
  4. Step 4: Simplify right side
    739.92x = 701,382.59
  5. Step 5: Solve for x
    x = 701,382.59/739.92
  6. Step 6: Final answer
    x = 947.91

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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.