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Finding the Fourth Proportional to 739.23, 1,108.91 and 392.31

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Solution

The fourth proportional to 739.23, 1,108.91 and 392.31 is: 588.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.23 : 1,108.91 = 392.31 : x
  2. Step 2: Convert to fraction form
    739.23/1,108.91 = 392.31/x
  3. Step 3: Cross multiply
    739.23x = 1,108.91 × 392.31
  4. Step 4: Simplify right side
    739.23x = 435,036.48
  5. Step 5: Solve for x
    x = 435,036.48/739.23
  6. Step 6: Final answer
    x = 588.50

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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.