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Finding the Fourth Proportional to 416.18, 624.49 and 318.62

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Solution

The fourth proportional to 416.18, 624.49 and 318.62 is: 478.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.18 : 624.49 = 318.62 : x
  2. Step 2: Convert to fraction form
    416.18/624.49 = 318.62/x
  3. Step 3: Cross multiply
    416.18x = 624.49 × 318.62
  4. Step 4: Simplify right side
    416.18x = 198,977.36
  5. Step 5: Solve for x
    x = 198,977.36/416.18
  6. Step 6: Final answer
    x = 478.10

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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.