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Finding the Fourth Proportional to 414.72, 622.08 and 318.72

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Solution

The fourth proportional to 414.72, 622.08 and 318.72 is: 478.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.72 : 622.08 = 318.72 : x
  2. Step 2: Convert to fraction form
    414.72/622.08 = 318.72/x
  3. Step 3: Cross multiply
    414.72x = 622.08 × 318.72
  4. Step 4: Simplify right side
    414.72x = 198,269.34
  5. Step 5: Solve for x
    x = 198,269.34/414.72
  6. Step 6: Final answer
    x = 478.08

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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.