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Finding the Fourth Proportional to 419.54, 628.62 and 145.49

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Solution

The fourth proportional to 419.54, 628.62 and 145.49 is: 217.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.54 : 628.62 = 145.49 : x
  2. Step 2: Convert to fraction form
    419.54/628.62 = 145.49/x
  3. Step 3: Cross multiply
    419.54x = 628.62 × 145.49
  4. Step 4: Simplify right side
    419.54x = 91,454.24
  5. Step 5: Solve for x
    x = 91,454.24/419.54
  6. Step 6: Final answer
    x = 217.99

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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.