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Finding the Fourth Proportional to 419.20, 628.88 and 162.88

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Solution

The fourth proportional to 419.20, 628.88 and 162.88 is: 244.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.20 : 628.88 = 162.88 : x
  2. Step 2: Convert to fraction form
    419.20/628.88 = 162.88/x
  3. Step 3: Cross multiply
    419.20x = 628.88 × 162.88
  4. Step 4: Simplify right side
    419.20x = 102,431.97
  5. Step 5: Solve for x
    x = 102,431.97/419.20
  6. Step 6: Final answer
    x = 244.35

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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.