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Finding the Fourth Proportional to 739.60, 1,108.40 and 328.48

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Solution

The fourth proportional to 739.60, 1,108.40 and 328.48 is: 492.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.60 : 1,108.40 = 328.48 : x
  2. Step 2: Convert to fraction form
    739.60/1,108.40 = 328.48/x
  3. Step 3: Cross multiply
    739.60x = 1,108.40 × 328.48
  4. Step 4: Simplify right side
    739.60x = 364,087.23
  5. Step 5: Solve for x
    x = 364,087.23/739.60
  6. Step 6: Final answer
    x = 492.28

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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.