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Finding the Fourth Proportional to 742.45, 1,024.91 and 443.80

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Solution

The fourth proportional to 742.45, 1,024.91 and 443.80 is: 612.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.45 : 1,024.91 = 443.80 : x
  2. Step 2: Convert to fraction form
    742.45/1,024.91 = 443.80/x
  3. Step 3: Cross multiply
    742.45x = 1,024.91 × 443.80
  4. Step 4: Simplify right side
    742.45x = 454,850.28
  5. Step 5: Solve for x
    x = 454,850.28/742.45
  6. Step 6: Final answer
    x = 612.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.