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Finding the Fourth Proportional to 419.40, 624.96 and 414.72

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Solution

The fourth proportional to 419.40, 624.96 and 414.72 is: 617.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.40 : 624.96 = 414.72 : x
  2. Step 2: Convert to fraction form
    419.40/624.96 = 414.72/x
  3. Step 3: Cross multiply
    419.40x = 624.96 × 414.72
  4. Step 4: Simplify right side
    419.40x = 259,183.41
  5. Step 5: Solve for x
    x = 259,183.41/419.40
  6. Step 6: Final answer
    x = 617.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.