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Finding the Fourth Proportional to 489.60, 673.92 and 446.40

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Solution

The fourth proportional to 489.60, 673.92 and 446.40 is: 614.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.60 : 673.92 = 446.40 : x
  2. Step 2: Convert to fraction form
    489.60/673.92 = 446.40/x
  3. Step 3: Cross multiply
    489.60x = 673.92 × 446.40
  4. Step 4: Simplify right side
    489.60x = 300,837.89
  5. Step 5: Solve for x
    x = 300,837.89/489.60
  6. Step 6: Final answer
    x = 614.46

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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.