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Finding the Fourth Proportional to 355.12, 489 and 308.44

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Solution

The fourth proportional to 355.12, 489 and 308.44 is: 424.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.12 : 489 = 308.44 : x
  2. Step 2: Convert to fraction form
    355.12/489 = 308.44/x
  3. Step 3: Cross multiply
    355.12x = 489 × 308.44
  4. Step 4: Simplify right side
    355.12x = 150,827.16
  5. Step 5: Solve for x
    x = 150,827.16/355.12
  6. Step 6: Final answer
    x = 424.72

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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.