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Finding the Fourth Proportional to 354.81, 489.74 and 214.91

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Solution

The fourth proportional to 354.81, 489.74 and 214.91 is: 296.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.81 : 489.74 = 214.91 : x
  2. Step 2: Convert to fraction form
    354.81/489.74 = 214.91/x
  3. Step 3: Cross multiply
    354.81x = 489.74 × 214.91
  4. Step 4: Simplify right side
    354.81x = 105,246.50
  5. Step 5: Solve for x
    x = 105,246.50/354.81
  6. Step 6: Final answer
    x = 296.63

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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.