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Finding the Fourth Proportional to 419.51, 629.56 and 145.61

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Solution

The fourth proportional to 419.51, 629.56 and 145.61 is: 218.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.51 : 629.56 = 145.61 : x
  2. Step 2: Convert to fraction form
    419.51/629.56 = 145.61/x
  3. Step 3: Cross multiply
    419.51x = 629.56 × 145.61
  4. Step 4: Simplify right side
    419.51x = 91,669.63
  5. Step 5: Solve for x
    x = 91,669.63/419.51
  6. Step 6: Final answer
    x = 218.51

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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.