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Finding the Fourth Proportional to 739.57, 1,108.74 and 328.58

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Solution

The fourth proportional to 739.57, 1,108.74 and 328.58 is: 492.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.57 : 1,108.74 = 328.58 : x
  2. Step 2: Convert to fraction form
    739.57/1,108.74 = 328.58/x
  3. Step 3: Cross multiply
    739.57x = 1,108.74 × 328.58
  4. Step 4: Simplify right side
    739.57x = 364,309.79
  5. Step 5: Solve for x
    x = 364,309.79/739.57
  6. Step 6: Final answer
    x = 492.60

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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.