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Finding the Fourth Proportional to 739.47, 1,109.60 and 328.91

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Solution

The fourth proportional to 739.47, 1,109.60 and 328.91 is: 493.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.47 : 1,109.60 = 328.91 : x
  2. Step 2: Convert to fraction form
    739.47/1,109.60 = 328.91/x
  3. Step 3: Cross multiply
    739.47x = 1,109.60 × 328.91
  4. Step 4: Simplify right side
    739.47x = 364,952.58
  5. Step 5: Solve for x
    x = 364,952.58/739.47
  6. Step 6: Final answer
    x = 493.53

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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.