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Finding the Fourth Proportional to 739.90, 1,108.94 and 648.78

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Solution

The fourth proportional to 739.90, 1,108.94 and 648.78 is: 972.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.90 : 1,108.94 = 648.78 : x
  2. Step 2: Convert to fraction form
    739.90/1,108.94 = 648.78/x
  3. Step 3: Cross multiply
    739.90x = 1,108.94 × 648.78
  4. Step 4: Simplify right side
    739.90x = 719,458.09
  5. Step 5: Solve for x
    x = 719,458.09/739.90
  6. Step 6: Final answer
    x = 972.37

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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.