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Finding the Fourth Proportional to 354.42, 489.14 and 214.56

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Solution

The fourth proportional to 354.42, 489.14 and 214.56 is: 296.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.42 : 489.14 = 214.56 : x
  2. Step 2: Convert to fraction form
    354.42/489.14 = 214.56/x
  3. Step 3: Cross multiply
    354.42x = 489.14 × 214.56
  4. Step 4: Simplify right side
    354.42x = 104,949.88
  5. Step 5: Solve for x
    x = 104,949.88/354.42
  6. Step 6: Final answer
    x = 296.12

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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.