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Finding the Fourth Proportional to 443.81, 612.39 and 257.31

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Solution

The fourth proportional to 443.81, 612.39 and 257.31 is: 355.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.81 : 612.39 = 257.31 : x
  2. Step 2: Convert to fraction form
    443.81/612.39 = 257.31/x
  3. Step 3: Cross multiply
    443.81x = 612.39 × 257.31
  4. Step 4: Simplify right side
    443.81x = 157,572.74
  5. Step 5: Solve for x
    x = 157,572.74/443.81
  6. Step 6: Final answer
    x = 355.05

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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.