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Finding the Fourth Proportional to 490.71, 732.64 and 421.95

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Solution

The fourth proportional to 490.71, 732.64 and 421.95 is: 629.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.71 : 732.64 = 421.95 : x
  2. Step 2: Convert to fraction form
    490.71/732.64 = 421.95/x
  3. Step 3: Cross multiply
    490.71x = 732.64 × 421.95
  4. Step 4: Simplify right side
    490.71x = 309,136.39
  5. Step 5: Solve for x
    x = 309,136.39/490.71
  6. Step 6: Final answer
    x = 629.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.