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Finding the Fourth Proportional to 739.28, 1,020.78 and 459.92

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Solution

The fourth proportional to 739.28, 1,020.78 and 459.92 is: 635.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.28 : 1,020.78 = 459.92 : x
  2. Step 2: Convert to fraction form
    739.28/1,020.78 = 459.92/x
  3. Step 3: Cross multiply
    739.28x = 1,020.78 × 459.92
  4. Step 4: Simplify right side
    739.28x = 469,477.14
  5. Step 5: Solve for x
    x = 469,477.14/739.28
  6. Step 6: Final answer
    x = 635.05

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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.