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Finding the Fourth Proportional to 742.44, 1,113.42 and 621.48

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Solution

The fourth proportional to 742.44, 1,113.42 and 621.48 is: 932.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.44 : 1,113.42 = 621.48 : x
  2. Step 2: Convert to fraction form
    742.44/1,113.42 = 621.48/x
  3. Step 3: Cross multiply
    742.44x = 1,113.42 × 621.48
  4. Step 4: Simplify right side
    742.44x = 691,968.26
  5. Step 5: Solve for x
    x = 691,968.26/742.44
  6. Step 6: Final answer
    x = 932.02

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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.