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Finding the Fourth Proportional to 489.08, 674.78 and 314.12

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Solution

The fourth proportional to 489.08, 674.78 and 314.12 is: 433.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.08 : 674.78 = 314.12 : x
  2. Step 2: Convert to fraction form
    489.08/674.78 = 314.12/x
  3. Step 3: Cross multiply
    489.08x = 674.78 × 314.12
  4. Step 4: Simplify right side
    489.08x = 211,961.89
  5. Step 5: Solve for x
    x = 211,961.89/489.08
  6. Step 6: Final answer
    x = 433.39

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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.