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Finding the Fourth Proportional to 739.25, 1,109.61 and 392.59

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Solution

The fourth proportional to 739.25, 1,109.61 and 392.59 is: 589.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.25 : 1,109.61 = 392.59 : x
  2. Step 2: Convert to fraction form
    739.25/1,109.61 = 392.59/x
  3. Step 3: Cross multiply
    739.25x = 1,109.61 × 392.59
  4. Step 4: Simplify right side
    739.25x = 435,615.03
  5. Step 5: Solve for x
    x = 435,615.03/739.25
  6. Step 6: Final answer
    x = 589.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.