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Finding the Fourth Proportional to 318.67, 478.20 and 245.26

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Solution

The fourth proportional to 318.67, 478.20 and 245.26 is: 368.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.67 : 478.20 = 245.26 : x
  2. Step 2: Convert to fraction form
    318.67/478.20 = 245.26/x
  3. Step 3: Cross multiply
    318.67x = 478.20 × 245.26
  4. Step 4: Simplify right side
    318.67x = 117,284.85
  5. Step 5: Solve for x
    x = 117,284.85/318.67
  6. Step 6: Final answer
    x = 368.05

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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.