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Finding the Fourth Proportional to 419.49, 628.20 and 245.70

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Solution

The fourth proportional to 419.49, 628.20 and 245.70 is: 367.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.49 : 628.20 = 245.70 : x
  2. Step 2: Convert to fraction form
    419.49/628.20 = 245.70/x
  3. Step 3: Cross multiply
    419.49x = 628.20 × 245.70
  4. Step 4: Simplify right side
    419.49x = 154,348.74
  5. Step 5: Solve for x
    x = 154,348.74/419.49
  6. Step 6: Final answer
    x = 367.94

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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.