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Finding the Fourth Proportional to 354.62, 489.14 and 216.62

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Solution

The fourth proportional to 354.62, 489.14 and 216.62 is: 298.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.62 : 489.14 = 216.62 : x
  2. Step 2: Convert to fraction form
    354.62/489.14 = 216.62/x
  3. Step 3: Cross multiply
    354.62x = 489.14 × 216.62
  4. Step 4: Simplify right side
    354.62x = 105,957.51
  5. Step 5: Solve for x
    x = 105,957.51/354.62
  6. Step 6: Final answer
    x = 298.79

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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.