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Finding the Fourth Proportional to 318.74, 477.06 and 172.28

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Solution

The fourth proportional to 318.74, 477.06 and 172.28 is: 257.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.74 : 477.06 = 172.28 : x
  2. Step 2: Convert to fraction form
    318.74/477.06 = 172.28/x
  3. Step 3: Cross multiply
    318.74x = 477.06 × 172.28
  4. Step 4: Simplify right side
    318.74x = 82,187.90
  5. Step 5: Solve for x
    x = 82,187.90/318.74
  6. Step 6: Final answer
    x = 257.85

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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.