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Finding the Fourth Proportional to 489.48, 734.48 and 381.48

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Solution

The fourth proportional to 489.48, 734.48 and 381.48 is: 572.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.48 : 734.48 = 381.48 : x
  2. Step 2: Convert to fraction form
    489.48/734.48 = 381.48/x
  3. Step 3: Cross multiply
    489.48x = 734.48 × 381.48
  4. Step 4: Simplify right side
    489.48x = 280,189.43
  5. Step 5: Solve for x
    x = 280,189.43/489.48
  6. Step 6: Final answer
    x = 572.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.