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Finding the Fourth Proportional to 419.60, 628.58 and 274.88

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Solution

The fourth proportional to 419.60, 628.58 and 274.88 is: 411.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.60 : 628.58 = 274.88 : x
  2. Step 2: Convert to fraction form
    419.60/628.58 = 274.88/x
  3. Step 3: Cross multiply
    419.60x = 628.58 × 274.88
  4. Step 4: Simplify right side
    419.60x = 172,784.07
  5. Step 5: Solve for x
    x = 172,784.07/419.60
  6. Step 6: Final answer
    x = 411.78

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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.