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Finding the Fourth Proportional to 422.23, 629.73 and 407.53

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Solution

The fourth proportional to 422.23, 629.73 and 407.53 is: 607.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.23 : 629.73 = 407.53 : x
  2. Step 2: Convert to fraction form
    422.23/629.73 = 407.53/x
  3. Step 3: Cross multiply
    422.23x = 629.73 × 407.53
  4. Step 4: Simplify right side
    422.23x = 256,637.76
  5. Step 5: Solve for x
    x = 256,637.76/422.23
  6. Step 6: Final answer
    x = 607.82

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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.