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Finding the Fourth Proportional to 489.63, 734.49 and 394.05

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Solution

The fourth proportional to 489.63, 734.49 and 394.05 is: 591.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.63 : 734.49 = 394.05 : x
  2. Step 2: Convert to fraction form
    489.63/734.49 = 394.05/x
  3. Step 3: Cross multiply
    489.63x = 734.49 × 394.05
  4. Step 4: Simplify right side
    489.63x = 289,425.78
  5. Step 5: Solve for x
    x = 289,425.78/489.63
  6. Step 6: Final answer
    x = 591.11

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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.