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Finding the Fourth Proportional to 490.64, 736.34 and 285.40

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Solution

The fourth proportional to 490.64, 736.34 and 285.40 is: 428.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.64 : 736.34 = 285.40 : x
  2. Step 2: Convert to fraction form
    490.64/736.34 = 285.40/x
  3. Step 3: Cross multiply
    490.64x = 736.34 × 285.40
  4. Step 4: Simplify right side
    490.64x = 210,151.44
  5. Step 5: Solve for x
    x = 210,151.44/490.64
  6. Step 6: Final answer
    x = 428.32

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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.