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Finding the Fourth Proportional to 419.73, 629.40 and 145.74

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Solution

The fourth proportional to 419.73, 629.40 and 145.74 is: 218.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.73 : 629.40 = 145.74 : x
  2. Step 2: Convert to fraction form
    419.73/629.40 = 145.74/x
  3. Step 3: Cross multiply
    419.73x = 629.40 × 145.74
  4. Step 4: Simplify right side
    419.73x = 91,728.76
  5. Step 5: Solve for x
    x = 91,728.76/419.73
  6. Step 6: Final answer
    x = 218.54

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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.