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Finding the Fourth Proportional to 492.21, 738.72 and 489.78

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Solution

The fourth proportional to 492.21, 738.72 and 489.78 is: 735.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.21 : 738.72 = 489.78 : x
  2. Step 2: Convert to fraction form
    492.21/738.72 = 489.78/x
  3. Step 3: Cross multiply
    492.21x = 738.72 × 489.78
  4. Step 4: Simplify right side
    492.21x = 361,810.28
  5. Step 5: Solve for x
    x = 361,810.28/492.21
  6. Step 6: Final answer
    x = 735.07

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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.