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Finding the Fourth Proportional to 742.55, 1,111.49 and 664.29

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Solution

The fourth proportional to 742.55, 1,111.49 and 664.29 is: 994.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.55 : 1,111.49 = 664.29 : x
  2. Step 2: Convert to fraction form
    742.55/1,111.49 = 664.29/x
  3. Step 3: Cross multiply
    742.55x = 1,111.49 × 664.29
  4. Step 4: Simplify right side
    742.55x = 738,342.81
  5. Step 5: Solve for x
    x = 738,342.81/742.55
  6. Step 6: Final answer
    x = 994.33

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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.