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Finding the Fourth Proportional to 739.44, 1,108.80 and 431.39

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Solution

The fourth proportional to 739.44, 1,108.80 and 431.39 is: 646.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.44 : 1,108.80 = 431.39 : x
  2. Step 2: Convert to fraction form
    739.44/1,108.80 = 431.39/x
  3. Step 3: Cross multiply
    739.44x = 1,108.80 × 431.39
  4. Step 4: Simplify right side
    739.44x = 478,328.00
  5. Step 5: Solve for x
    x = 478,328.00/739.44
  6. Step 6: Final answer
    x = 646.88

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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.