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Finding the Fourth Proportional to 317.68, 475.48 and 172.72

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Solution

The fourth proportional to 317.68, 475.48 and 172.72 is: 258.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.68 : 475.48 = 172.72 : x
  2. Step 2: Convert to fraction form
    317.68/475.48 = 172.72/x
  3. Step 3: Cross multiply
    317.68x = 475.48 × 172.72
  4. Step 4: Simplify right side
    317.68x = 82,124.91
  5. Step 5: Solve for x
    x = 82,124.91/317.68
  6. Step 6: Final answer
    x = 258.51

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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.