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Finding the Fourth Proportional to 489.42, 674.73 and 415.44

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Solution

The fourth proportional to 489.42, 674.73 and 415.44 is: 572.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.42 : 674.73 = 415.44 : x
  2. Step 2: Convert to fraction form
    489.42/674.73 = 415.44/x
  3. Step 3: Cross multiply
    489.42x = 674.73 × 415.44
  4. Step 4: Simplify right side
    489.42x = 280,309.83
  5. Step 5: Solve for x
    x = 280,309.83/489.42
  6. Step 6: Final answer
    x = 572.74

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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.