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Finding the Fourth Proportional to 416.05, 624.09 and 318.69

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Solution

The fourth proportional to 416.05, 624.09 and 318.69 is: 478.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.05 : 624.09 = 318.69 : x
  2. Step 2: Convert to fraction form
    416.05/624.09 = 318.69/x
  3. Step 3: Cross multiply
    416.05x = 624.09 × 318.69
  4. Step 4: Simplify right side
    416.05x = 198,891.24
  5. Step 5: Solve for x
    x = 198,891.24/416.05
  6. Step 6: Final answer
    x = 478.05

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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.