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Finding the Fourth Proportional to 419.70, 629.46 and 145.77

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Solution

The fourth proportional to 419.70, 629.46 and 145.77 is: 218.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.70 : 629.46 = 145.77 : x
  2. Step 2: Convert to fraction form
    419.70/629.46 = 145.77/x
  3. Step 3: Cross multiply
    419.70x = 629.46 × 145.77
  4. Step 4: Simplify right side
    419.70x = 91,756.38
  5. Step 5: Solve for x
    x = 91,756.38/419.70
  6. Step 6: Final answer
    x = 218.62

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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.