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Finding the Fourth Proportional to 443.57, 612.12 and 257.09

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Solution

The fourth proportional to 443.57, 612.12 and 257.09 is: 354.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.57 : 612.12 = 257.09 : x
  2. Step 2: Convert to fraction form
    443.57/612.12 = 257.09/x
  3. Step 3: Cross multiply
    443.57x = 612.12 × 257.09
  4. Step 4: Simplify right side
    443.57x = 157,371.28
  5. Step 5: Solve for x
    x = 157,371.28/443.57
  6. Step 6: Final answer
    x = 354.79

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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.