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Finding the Fourth Proportional to 355.54, 489.96 and 257.11

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Solution

The fourth proportional to 355.54, 489.96 and 257.11 is: 354.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.54 : 489.96 = 257.11 : x
  2. Step 2: Convert to fraction form
    355.54/489.96 = 257.11/x
  3. Step 3: Cross multiply
    355.54x = 489.96 × 257.11
  4. Step 4: Simplify right side
    355.54x = 125,973.62
  5. Step 5: Solve for x
    x = 125,973.62/355.54
  6. Step 6: Final answer
    x = 354.32

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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.