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Finding the Fourth Proportional to 355.81, 489.03 and 314.11

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Solution

The fourth proportional to 355.81, 489.03 and 314.11 is: 431.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.81 : 489.03 = 314.11 : x
  2. Step 2: Convert to fraction form
    355.81/489.03 = 314.11/x
  3. Step 3: Cross multiply
    355.81x = 489.03 × 314.11
  4. Step 4: Simplify right side
    355.81x = 153,606.81
  5. Step 5: Solve for x
    x = 153,606.81/355.81
  6. Step 6: Final answer
    x = 431.71

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.