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Finding the Fourth Proportional to 443.52, 612.20 and 257.11

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Solution

The fourth proportional to 443.52, 612.20 and 257.11 is: 354.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.52 : 612.20 = 257.11 : x
  2. Step 2: Convert to fraction form
    443.52/612.20 = 257.11/x
  3. Step 3: Cross multiply
    443.52x = 612.20 × 257.11
  4. Step 4: Simplify right side
    443.52x = 157,401.85
  5. Step 5: Solve for x
    x = 157,401.85/443.52
  6. Step 6: Final answer
    x = 354.89

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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.