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Finding the Fourth Proportional to 354.18, 489.38 and 281.14

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Solution

The fourth proportional to 354.18, 489.38 and 281.14 is: 388.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.18 : 489.38 = 281.14 : x
  2. Step 2: Convert to fraction form
    354.18/489.38 = 281.14/x
  3. Step 3: Cross multiply
    354.18x = 489.38 × 281.14
  4. Step 4: Simplify right side
    354.18x = 137,581.66
  5. Step 5: Solve for x
    x = 137,581.66/354.18
  6. Step 6: Final answer
    x = 388.45

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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.