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Finding the Fourth Proportional to 740.62, 1,109.70 and 664.31

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Solution

The fourth proportional to 740.62, 1,109.70 and 664.31 is: 995.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.62 : 1,109.70 = 664.31 : x
  2. Step 2: Convert to fraction form
    740.62/1,109.70 = 664.31/x
  3. Step 3: Cross multiply
    740.62x = 1,109.70 × 664.31
  4. Step 4: Simplify right side
    740.62x = 737,175.94
  5. Step 5: Solve for x
    x = 737,175.94/740.62
  6. Step 6: Final answer
    x = 995.36

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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.