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Finding the Fourth Proportional to 318.72, 477.90 and 172.29

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Solution

The fourth proportional to 318.72, 477.90 and 172.29 is: 258.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.72 : 477.90 = 172.29 : x
  2. Step 2: Convert to fraction form
    318.72/477.90 = 172.29/x
  3. Step 3: Cross multiply
    318.72x = 477.90 × 172.29
  4. Step 4: Simplify right side
    318.72x = 82,337.39
  5. Step 5: Solve for x
    x = 82,337.39/318.72
  6. Step 6: Final answer
    x = 258.34

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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.