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Finding the Fourth Proportional to 419.22, 628.90 and 145.23

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Solution

The fourth proportional to 419.22, 628.90 and 145.23 is: 217.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.22 : 628.90 = 145.23 : x
  2. Step 2: Convert to fraction form
    419.22/628.90 = 145.23/x
  3. Step 3: Cross multiply
    419.22x = 628.90 × 145.23
  4. Step 4: Simplify right side
    419.22x = 91,337.73
  5. Step 5: Solve for x
    x = 91,337.73/419.22
  6. Step 6: Final answer
    x = 217.88

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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.