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Finding the Fourth Proportional to 489.72, 674.60 and 454.28

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Solution

The fourth proportional to 489.72, 674.60 and 454.28 is: 625.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.72 : 674.60 = 454.28 : x
  2. Step 2: Convert to fraction form
    489.72/674.60 = 454.28/x
  3. Step 3: Cross multiply
    489.72x = 674.60 × 454.28
  4. Step 4: Simplify right side
    489.72x = 306,457.29
  5. Step 5: Solve for x
    x = 306,457.29/489.72
  6. Step 6: Final answer
    x = 625.78

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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.