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Finding the Fourth Proportional to 489.60, 675.60 and 323.48

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Solution

The fourth proportional to 489.60, 675.60 and 323.48 is: 446.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.60 : 675.60 = 323.48 : x
  2. Step 2: Convert to fraction form
    489.60/675.60 = 323.48/x
  3. Step 3: Cross multiply
    489.60x = 675.60 × 323.48
  4. Step 4: Simplify right side
    489.60x = 218,543.09
  5. Step 5: Solve for x
    x = 218,543.09/489.60
  6. Step 6: Final answer
    x = 446.37

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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.