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Finding the Fourth Proportional to 489, 674.61 and 302.43

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Solution

The fourth proportional to 489, 674.61 and 302.43 is: 417.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    489 : 674.61 = 302.43 : x
  2. Step 2: Convert to fraction form
    489/674.61 = 302.43/x
  3. Step 3: Cross multiply
    489x = 674.61 × 302.43
  4. Step 4: Simplify right side
    489x = 204,022.30
  5. Step 5: Solve for x
    x = 204,022.30/489
  6. Step 6: Final answer
    x = 417.22

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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.