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Finding the Fourth Proportional to 354.63, 489.39 and 199.38

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Solution

The fourth proportional to 354.63, 489.39 and 199.38 is: 275.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.63 : 489.39 = 199.38 : x
  2. Step 2: Convert to fraction form
    354.63/489.39 = 199.38/x
  3. Step 3: Cross multiply
    354.63x = 489.39 × 199.38
  4. Step 4: Simplify right side
    354.63x = 97,574.58
  5. Step 5: Solve for x
    x = 97,574.58/354.63
  6. Step 6: Final answer
    x = 275.14

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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.