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Finding the Fourth Proportional to 495.02, 687.43 and 490.22

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Solution

The fourth proportional to 495.02, 687.43 and 490.22 is: 680.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.02 : 687.43 = 490.22 : x
  2. Step 2: Convert to fraction form
    495.02/687.43 = 490.22/x
  3. Step 3: Cross multiply
    495.02x = 687.43 × 490.22
  4. Step 4: Simplify right side
    495.02x = 336,989.48
  5. Step 5: Solve for x
    x = 336,989.48/495.02
  6. Step 6: Final answer
    x = 680.76

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.