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Finding the Fourth Proportional to 443.66, 612.36 and 257.18

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Solution

The fourth proportional to 443.66, 612.36 and 257.18 is: 354.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.66 : 612.36 = 257.18 : x
  2. Step 2: Convert to fraction form
    443.66/612.36 = 257.18/x
  3. Step 3: Cross multiply
    443.66x = 612.36 × 257.18
  4. Step 4: Simplify right side
    443.66x = 157,483.68
  5. Step 5: Solve for x
    x = 157,483.68/443.66
  6. Step 6: Final answer
    x = 354.97

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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.