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Finding the Fourth Proportional to 489.07, 674.90 and 282.07

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Solution

The fourth proportional to 489.07, 674.90 and 282.07 is: 389.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.07 : 674.90 = 282.07 : x
  2. Step 2: Convert to fraction form
    489.07/674.90 = 282.07/x
  3. Step 3: Cross multiply
    489.07x = 674.90 × 282.07
  4. Step 4: Simplify right side
    489.07x = 190,369.04
  5. Step 5: Solve for x
    x = 190,369.04/489.07
  6. Step 6: Final answer
    x = 389.25

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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.